[{"status":"public","title":"Current-phase relation of ballistic graphene Josephson junctions","year":"2017","publisher":"American Chemical Society","ddc":["621"],"doi":"10.1021/acs.nanolett.7b00097","oa_version":"Published Version","publist_id":"6412","has_accepted_license":"1","type":"journal_article","file_date_updated":"2020-07-14T12:48:18Z","author":[{"full_name":"Nanda, Gaurav","first_name":"Gaurav","last_name":"Nanda"},{"full_name":"Aguilera Servin, Juan L","first_name":"Juan L","last_name":"Aguilera Servin","id":"2A67C376-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2862-8372"},{"first_name":"Péter","last_name":"Rakyta","full_name":"Rakyta, Péter"},{"last_name":"Kormányos","first_name":"Andor","full_name":"Kormányos, Andor"},{"full_name":"Kleiner, Reinhold","last_name":"Kleiner","first_name":"Reinhold"},{"full_name":"Koelle, Dieter","last_name":"Koelle","first_name":"Dieter"},{"first_name":"Kazuo","last_name":"Watanabe","full_name":"Watanabe, Kazuo"},{"first_name":"Takashi","last_name":"Taniguchi","full_name":"Taniguchi, Takashi"},{"full_name":"Vandersypen, Lieven","first_name":"Lieven","last_name":"Vandersypen"},{"last_name":"Goswami","first_name":"Srijit","full_name":"Goswami, Srijit"}],"date_updated":"2023-09-22T09:56:21Z","external_id":{"isi":["000403631600011"]},"file":[{"date_updated":"2020-07-14T12:48:18Z","file_size":508638,"file_id":"5037","creator":"system","date_created":"2018-12-12T10:13:50Z","access_level":"open_access","checksum":"22021daa90cf13b01becd776838acb7b","relation":"main_file","file_name":"IST-2017-826-v1+1_2017_Aguilera-Servin_Current.pdf","content_type":"application/pdf"}],"issue":"6","page":"3396 - 3401","language":[{"iso":"eng"}],"date_published":"2017-05-05T00:00:00Z","quality_controlled":"1","_id":"988","tmp":{"name":"Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)","image":"/images/cc_by_nc_nd.png","short":"CC BY-NC-ND (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode"},"article_processing_charge":"No","month":"05","publication_identifier":{"issn":["15306984"]},"publication":"Nano Letters","citation":{"mla":"Nanda, Gaurav, et al. “Current-Phase Relation of Ballistic Graphene Josephson Junctions.” Nano Letters, vol. 17, no. 6, American Chemical Society, 2017, pp. 3396–401, doi:10.1021/acs.nanolett.7b00097.","chicago":"Nanda, Gaurav, Juan L Aguilera Servin, Péter Rakyta, Andor Kormányos, Reinhold Kleiner, Dieter Koelle, Kazuo Watanabe, Takashi Taniguchi, Lieven Vandersypen, and Srijit Goswami. “Current-Phase Relation of Ballistic Graphene Josephson Junctions.” Nano Letters. American Chemical Society, 2017. https://doi.org/10.1021/acs.nanolett.7b00097.","apa":"Nanda, G., Aguilera Servin, J. L., Rakyta, P., Kormányos, A., Kleiner, R., Koelle, D., … Goswami, S. (2017). Current-phase relation of ballistic graphene Josephson junctions. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.7b00097","ieee":"G. Nanda et al., “Current-phase relation of ballistic graphene Josephson junctions,” Nano Letters, vol. 17, no. 6. American Chemical Society, pp. 3396–3401, 2017.","short":"G. Nanda, J.L. Aguilera Servin, P. Rakyta, A. Kormányos, R. Kleiner, D. Koelle, K. Watanabe, T. Taniguchi, L. Vandersypen, S. Goswami, Nano Letters 17 (2017) 3396–3401.","ama":"Nanda G, Aguilera Servin JL, Rakyta P, et al. Current-phase relation of ballistic graphene Josephson junctions. Nano Letters. 2017;17(6):3396-3401. doi:10.1021/acs.nanolett.7b00097","ista":"Nanda G, Aguilera Servin JL, Rakyta P, Kormányos A, Kleiner R, Koelle D, Watanabe K, Taniguchi T, Vandersypen L, Goswami S. 2017. Current-phase relation of ballistic graphene Josephson junctions. Nano Letters. 17(6), 3396–3401."},"department":[{"_id":"NanoFab"}],"oa":1,"day":"05","scopus_import":"1","isi":1,"pubrep_id":"826","intvolume":" 17","volume":17,"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","date_created":"2018-12-11T11:49:33Z","abstract":[{"text":"The current-phase relation (CPR) of a Josephson junction (JJ) determines how the supercurrent evolves with the superconducting phase difference across the junction. Knowledge of the CPR is essential in order to understand the response of a JJ to various external parameters. Despite the rising interest in ultraclean encapsulated graphene JJs, the CPR of such junctions remains unknown. Here, we use a fully gate-tunable graphene superconducting quantum intereference device (SQUID) to determine the CPR of ballistic graphene JJs. Each of the two JJs in the SQUID is made with graphene encapsulated in hexagonal boron nitride. By independently controlling the critical current of the JJs, we can operate the SQUID either in a symmetric or asymmetric configuration. The highly asymmetric SQUID allows us to phase-bias one of the JJs and thereby directly obtain its CPR. The CPR is found to be skewed, deviating significantly from a sinusoidal form. The skewness can be tuned with the gate voltage and oscillates in antiphase with Fabry-Pérot resistance oscillations of the ballistic graphene cavity. We compare our experiments with tight-binding calculations that include realistic graphene-superconductor interfaces and find a good qualitative agreement.","lang":"eng"}],"publication_status":"published"},{"_id":"989","month":"05","article_processing_charge":"No","publication_identifier":{"issn":["03029743"]},"date_updated":"2023-09-22T09:55:50Z","external_id":{"isi":["000432210900045"]},"page":"563 - 577","language":[{"iso":"eng"}],"date_published":"2017-05-18T00:00:00Z","quality_controlled":"1","conference":{"location":"Kolding, Denmark","end_date":"2017-06-08","name":"SSVM: Scale Space and Variational Methods in Computer Vision","start_date":"2017-06-04"},"type":"conference","author":[{"id":"4C5696CE-F248-11E8-B48F-1D18A9856A87","full_name":"Maas, Jan","first_name":"Jan","last_name":"Maas","orcid":"0000-0002-0845-1338"},{"full_name":"Rumpf, Martin","last_name":"Rumpf","first_name":"Martin"},{"first_name":"Stefan","last_name":"Simon","full_name":"Simon, Stefan"}],"title":"Transport based image morphing with intensity modulation","year":"2017","status":"public","doi":"10.1007/978-3-319-58771-4_45","publisher":"Springer","publist_id":"6410","oa_version":"None","editor":[{"full_name":"Lauze, François","first_name":"François","last_name":"Lauze"},{"full_name":"Dong, Yiqiu","last_name":"Dong","first_name":"Yiqiu"},{"first_name":"Anders","last_name":"Bjorholm Dahl","full_name":"Bjorholm Dahl, Anders"}],"abstract":[{"text":"We present a generalized optimal transport model in which the mass-preserving constraint for the L2-Wasserstein distance is relaxed by introducing a source term in the continuity equation. The source term is also incorporated in the path energy by means of its squared L2-norm in time of a functional with linear growth in space. This extension of the original transport model enables local density modulations, which is a desirable feature in applications such as image warping and blending. A key advantage of the use of a functional with linear growth in space is that it allows for singular sources and sinks, which can be supported on points or lines. On a technical level, the L2-norm in time ensures a disintegration of the source in time, which we use to obtain the well-posedness of the model and the existence of geodesic paths. The numerical discretization is based on the proximal splitting approach [18] and selected numerical test cases show the potential of the proposed approach. Furthermore, the approach is applied to the warping and blending of textures.","lang":"eng"}],"publication_status":"published","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","intvolume":" 10302","volume":10302,"date_created":"2018-12-11T11:49:34Z","scopus_import":"1","alternative_title":["LNCS"],"day":"18","isi":1,"citation":{"ama":"Maas J, Rumpf M, Simon S. Transport based image morphing with intensity modulation. In: Lauze F, Dong Y, Bjorholm Dahl A, eds. Vol 10302. Springer; 2017:563-577. doi:10.1007/978-3-319-58771-4_45","ista":"Maas J, Rumpf M, Simon S. 2017. Transport based image morphing with intensity modulation. SSVM: Scale Space and Variational Methods in Computer Vision, LNCS, vol. 10302, 563–577.","short":"J. Maas, M. Rumpf, S. Simon, in:, F. Lauze, Y. Dong, A. Bjorholm Dahl (Eds.), Springer, 2017, pp. 563–577.","ieee":"J. Maas, M. Rumpf, and S. Simon, “Transport based image morphing with intensity modulation,” presented at the SSVM: Scale Space and Variational Methods in Computer Vision, Kolding, Denmark, 2017, vol. 10302, pp. 563–577.","apa":"Maas, J., Rumpf, M., & Simon, S. (2017). Transport based image morphing with intensity modulation. In F. Lauze, Y. Dong, & A. Bjorholm Dahl (Eds.) (Vol. 10302, pp. 563–577). Presented at the SSVM: Scale Space and Variational Methods in Computer Vision, Kolding, Denmark: Springer. https://doi.org/10.1007/978-3-319-58771-4_45","chicago":"Maas, Jan, Martin Rumpf, and Stefan Simon. “Transport Based Image Morphing with Intensity Modulation.” edited by François Lauze, Yiqiu Dong, and Anders Bjorholm Dahl, 10302:563–77. Springer, 2017. https://doi.org/10.1007/978-3-319-58771-4_45.","mla":"Maas, Jan, et al. Transport Based Image Morphing with Intensity Modulation. Edited by François Lauze et al., vol. 10302, Springer, 2017, pp. 563–77, doi:10.1007/978-3-319-58771-4_45."},"department":[{"_id":"JaMa"}]},{"publication_status":"published","abstract":[{"lang":"eng","text":"Assortative mating is an important driver of speciation in populations with gene flow and is predicted to evolve under certain conditions in few-locus models. However, the evolution of assortment is less understood for mating based on quantitative traits, which are often characterized by high genetic variability and extensive linkage disequilibrium between trait loci. We explore this scenario for a two-deme model with migration, by considering a single polygenic trait subject to divergent viability selection across demes, as well as assortative mating and sexual selection within demes, and investigate how trait divergence is shaped by various evolutionary forces. Our analysis reveals the existence of sharp thresholds of assortment strength, at which divergence increases dramatically. We also study the evolution of assortment via invasion of modifiers of mate discrimination and show that the ES assortment strength has an intermediate value under a range of migration-selection parameters, even in diverged populations, due to subtle effects which depend sensitively on the extent of phenotypic variation within these populations. The evolutionary dynamics of the polygenic trait is studied using the hypergeometric and infinitesimal models. We further investigate the sensitivity of our results to the assumptions of the hypergeometric model, using individual-based simulations."}],"project":[{"call_identifier":"FP7","grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme"},{"_id":"25B07788-B435-11E9-9278-68D0E5697425","grant_number":"250152","name":"Limits to selection in biology and in evolutionary computation","call_identifier":"FP7"}],"pmid":1,"date_created":"2018-12-11T11:49:34Z","volume":71,"intvolume":" 71","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","isi":1,"day":"01","scopus_import":"1","pubrep_id":"977","department":[{"_id":"NiBa"}],"citation":{"short":"H. Sachdeva, N.H. Barton, Evolution; International Journal of Organic Evolution 71 (2017) 1478–1493.","ama":"Sachdeva H, Barton NH. Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow. Evolution; International Journal of Organic Evolution. 2017;71(6):1478-1493. doi:10.1111/evo.13252","ista":"Sachdeva H, Barton NH. 2017. Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow. Evolution; International Journal of Organic Evolution. 71(6), 1478–1493.","mla":"Sachdeva, Himani, and Nicholas H. Barton. “Divergence and Evolution of Assortative Mating in a Polygenic Trait Model of Speciation with Gene Flow.” Evolution; International Journal of Organic Evolution, vol. 71, no. 6, Wiley-Blackwell, 2017, pp. 1478–93, doi:10.1111/evo.13252.","chicago":"Sachdeva, Himani, and Nicholas H Barton. “Divergence and Evolution of Assortative Mating in a Polygenic Trait Model of Speciation with Gene Flow.” Evolution; International Journal of Organic Evolution. Wiley-Blackwell, 2017. https://doi.org/10.1111/evo.13252.","ieee":"H. Sachdeva and N. H. Barton, “Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow,” Evolution; International Journal of Organic Evolution, vol. 71, no. 6. Wiley-Blackwell, pp. 1478–1493, 2017.","apa":"Sachdeva, H., & Barton, N. H. (2017). Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow. Evolution; International Journal of Organic Evolution. Wiley-Blackwell. https://doi.org/10.1111/evo.13252"},"publication":"Evolution; International Journal of Organic Evolution","oa":1,"ec_funded":1,"article_processing_charge":"No","month":"06","_id":"990","publication_identifier":{"issn":["00143820"]},"file":[{"content_type":"application/pdf","checksum":"6d4c38cb1347fd43620d1736c6df5c79","relation":"main_file","access_level":"open_access","file_name":"2017_Evolution_Sachdeva_supplement.pdf","creator":"dernst","file_id":"6329","date_created":"2019-04-17T07:37:04Z","date_updated":"2020-07-14T12:48:18Z","file_size":625260},{"content_type":"application/pdf","checksum":"f1d90dd8831b44baf49b4dd176f263af","relation":"main_file","access_level":"open_access","file_name":"2017_Evolution_Sachdeva_article.pdf","file_id":"6330","creator":"dernst","date_created":"2019-04-17T07:37:04Z","date_updated":"2020-07-14T12:48:18Z","file_size":520110}],"page":"1478 - 1493 ","issue":"6","external_id":{"isi":["000403014800005"],"pmid":["28419447"]},"date_updated":"2025-05-28T11:42:51Z","date_published":"2017-06-01T00:00:00Z","quality_controlled":"1","language":[{"iso":"eng"}],"type":"journal_article","author":[{"last_name":"Sachdeva","first_name":"Himani","full_name":"Sachdeva, Himani","id":"42377A0A-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0002-8548-5240","id":"4880FE40-F248-11E8-B48F-1D18A9856A87","last_name":"Barton","first_name":"Nicholas H","full_name":"Barton, Nicholas H"}],"file_date_updated":"2020-07-14T12:48:18Z","ddc":["576"],"publisher":"Wiley-Blackwell","doi":"10.1111/evo.13252","status":"public","title":"Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow","year":"2017","oa_version":"Submitted Version","publist_id":"6409","has_accepted_license":"1"},{"date_created":"2018-12-11T11:49:34Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","intvolume":" 94","volume":94,"publication_status":"published","abstract":[{"text":"Synaptotagmin 7 (Syt7) was originally identified as a slow Ca2+ sensor for lysosome fusion, but its function at fast synapses is controversial. The paper by Luo and Südhof (2017) in this issue of Neuron shows that at the calyx of Held in the auditory brainstem Syt7 triggers asynchronous release during stimulus trains, resulting in reliable and temporally precise high-frequency transmission. Thus, a slow Ca2+ sensor contributes to the fast signaling properties of the calyx synapse.","lang":"eng"}],"department":[{"_id":"PeJo"}],"citation":{"chicago":"Chen, Chong, and Peter M Jonas. “Synaptotagmins: That’s Why so Many.” Neuron. Elsevier, 2017. https://doi.org/10.1016/j.neuron.2017.05.011.","mla":"Chen, Chong, and Peter M. Jonas. “Synaptotagmins: That’s Why so Many.” Neuron, vol. 94, no. 4, Elsevier, 2017, pp. 694–96, doi:10.1016/j.neuron.2017.05.011.","ieee":"C. Chen and P. M. Jonas, “Synaptotagmins: That’s why so many,” Neuron, vol. 94, no. 4. Elsevier, pp. 694–696, 2017.","apa":"Chen, C., & Jonas, P. M. (2017). Synaptotagmins: That’s why so many. Neuron. Elsevier. https://doi.org/10.1016/j.neuron.2017.05.011","ama":"Chen C, Jonas PM. Synaptotagmins: That’s why so many. Neuron. 2017;94(4):694-696. doi:10.1016/j.neuron.2017.05.011","ista":"Chen C, Jonas PM. 2017. Synaptotagmins: That’s why so many. Neuron. 94(4), 694–696.","short":"C. Chen, P.M. Jonas, Neuron 94 (2017) 694–696."},"publication":"Neuron","isi":1,"day":"17","scopus_import":"1","quality_controlled":"1","date_published":"2017-05-17T00:00:00Z","language":[{"iso":"eng"}],"issue":"4","page":"694 - 696","date_updated":"2023-09-22T09:54:37Z","external_id":{"isi":["000401415100002"]},"publication_identifier":{"issn":["08966273"]},"month":"05","article_processing_charge":"No","_id":"991","publist_id":"6408","oa_version":"None","doi":"10.1016/j.neuron.2017.05.011","publisher":"Elsevier","title":"Synaptotagmins: That’s why so many","status":"public","year":"2017","author":[{"first_name":"Chong","last_name":"Chen","full_name":"Chen, Chong","id":"3DFD581A-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0001-5001-4804","last_name":"Jonas","first_name":"Peter M","full_name":"Jonas, Peter M","id":"353C1B58-F248-11E8-B48F-1D18A9856A87"}],"type":"journal_article"},{"publication_identifier":{"issn":["2663-337X"]},"article_processing_charge":"No","month":"05","_id":"992","date_published":"2017-05-01T00:00:00Z","language":[{"iso":"eng"}],"file":[{"file_size":786145,"date_updated":"2020-07-14T12:48:18Z","date_created":"2018-12-12T10:07:55Z","creator":"system","file_id":"4654","file_name":"IST-2017-815-v1+3_final_blank_signature_maybe_pdfa.pdf","relation":"main_file","checksum":"81761fb939acb7585c36629f765b4373","access_level":"open_access","content_type":"application/pdf"},{"date_created":"2019-04-05T08:43:24Z","file_id":"6208","creator":"dernst","file_size":5936337,"date_updated":"2020-07-14T12:48:18Z","content_type":"application/zip","file_name":"2017_Thesis_Rolinek_source.zip","relation":"source_file","checksum":"2b2d7e1d6c1c79a9795a7aa0f860baf3","access_level":"closed"}],"page":"97","date_updated":"2023-09-07T12:05:41Z","author":[{"id":"3CB3BC06-F248-11E8-B48F-1D18A9856A87","full_name":"Rolinek, Michal","last_name":"Rolinek","first_name":"Michal"}],"file_date_updated":"2020-07-14T12:48:18Z","type":"dissertation","oa_version":"Published Version","has_accepted_license":"1","publist_id":"6407","ddc":["004"],"publisher":"Institute of Science and Technology Austria","doi":"10.15479/AT:ISTA:th_815","year":"2017","status":"public","title":"Complexity of constraint satisfaction","acknowledgement":"FP7/2007-2013/ERC grant agreement no 616160","supervisor":[{"last_name":"Kolmogorov","first_name":"Vladimir","full_name":"Kolmogorov, Vladimir","id":"3D50B0BA-F248-11E8-B48F-1D18A9856A87"}],"project":[{"_id":"25FBA906-B435-11E9-9278-68D0E5697425","grant_number":"616160","name":"Discrete Optimization in Computer Vision: Theory and Practice","call_identifier":"FP7"}],"abstract":[{"lang":"eng","text":"An instance of the Constraint Satisfaction Problem (CSP) is given by a finite set of\r\nvariables, a finite domain of labels, and a set of constraints, each constraint acting on\r\na subset of the variables. The goal is to find an assignment of labels to its variables\r\nthat satisfies all constraints (or decide whether one exists). If we allow more general\r\n“soft” constraints, which come with (possibly infinite) costs of particular assignments,\r\nwe obtain instances from a richer class called Valued Constraint Satisfaction Problem\r\n(VCSP). There the goal is to find an assignment with minimum total cost.\r\nIn this thesis, we focus (assuming that P\r\n6\r\n=\r\nNP) on classifying computational com-\r\nplexity of CSPs and VCSPs under certain restricting conditions. Two results are the core\r\ncontent of the work. In one of them, we consider VCSPs parametrized by a constraint\r\nlanguage, that is the set of “soft” constraints allowed to form the instances, and finish\r\nthe complexity classification modulo (missing pieces of) complexity classification for\r\nanalogously parametrized CSP. The other result is a generalization of Edmonds’ perfect\r\nmatching algorithm. This generalization contributes to complexity classfications in two\r\nways. First, it gives a new (largest known) polynomial-time solvable class of Boolean\r\nCSPs in which every variable may appear in at most two constraints and second, it\r\nsettles full classification of Boolean CSPs with planar drawing (again parametrized by a\r\nconstraint language)."}],"publication_status":"published","date_created":"2018-12-11T11:49:35Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","degree_awarded":"PhD","pubrep_id":"815","alternative_title":["ISTA Thesis"],"day":"01","ec_funded":1,"oa":1,"citation":{"short":"M. Rolinek, Complexity of Constraint Satisfaction, Institute of Science and Technology Austria, 2017.","ama":"Rolinek M. Complexity of constraint satisfaction. 2017. doi:10.15479/AT:ISTA:th_815","ista":"Rolinek M. 2017. Complexity of constraint satisfaction. Institute of Science and Technology Austria.","mla":"Rolinek, Michal. Complexity of Constraint Satisfaction. Institute of Science and Technology Austria, 2017, doi:10.15479/AT:ISTA:th_815.","chicago":"Rolinek, Michal. “Complexity of Constraint Satisfaction.” Institute of Science and Technology Austria, 2017. https://doi.org/10.15479/AT:ISTA:th_815.","ieee":"M. Rolinek, “Complexity of constraint satisfaction,” Institute of Science and Technology Austria, 2017.","apa":"Rolinek, M. (2017). Complexity of constraint satisfaction. Institute of Science and Technology Austria. https://doi.org/10.15479/AT:ISTA:th_815"},"department":[{"_id":"VlKo"}]},{"ec_funded":1,"oa":1,"citation":{"ieee":"A. Levina (Martius) and V. Priesemann, “Subsampling scaling,” Nature Communications, vol. 8. Nature Publishing Group, 2017.","apa":"Levina (Martius), A., & Priesemann, V. (2017). Subsampling scaling. Nature Communications. Nature Publishing Group. https://doi.org/10.1038/ncomms15140","chicago":"Levina (Martius), Anna, and Viola Priesemann. “Subsampling Scaling.” Nature Communications. Nature Publishing Group, 2017. https://doi.org/10.1038/ncomms15140.","mla":"Levina (Martius), Anna, and Viola Priesemann. “Subsampling Scaling.” Nature Communications, vol. 8, 15140, Nature Publishing Group, 2017, doi:10.1038/ncomms15140.","ista":"Levina (Martius) A, Priesemann V. 2017. Subsampling scaling. Nature Communications. 8, 15140.","ama":"Levina (Martius) A, Priesemann V. Subsampling scaling. Nature Communications. 2017;8. doi:10.1038/ncomms15140","short":"A. Levina (Martius), V. Priesemann, Nature Communications 8 (2017)."},"department":[{"_id":"GaTk"},{"_id":"JoCs"}],"publication":"Nature Communications","pubrep_id":"819","isi":1,"day":"04","scopus_import":"1","date_created":"2018-12-11T11:49:35Z","volume":8,"intvolume":" 8","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","article_number":"15140","project":[{"call_identifier":"FP7","grant_number":"291734","_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme"}],"publication_status":"published","abstract":[{"text":"In real-world applications, observations are often constrained to a small fraction of a system. Such spatial subsampling can be caused by the inaccessibility or the sheer size of the system, and cannot be overcome by longer sampling. Spatial subsampling can strongly bias inferences about a system’s aggregated properties. To overcome the bias, we derive analytically a subsampling scaling framework that is applicable to different observables, including distributions of neuronal avalanches, of number of people infected during an epidemic outbreak, and of node degrees. We demonstrate how to infer the correct distributions of the underlying full system, how to apply it to distinguish critical from subcritical systems, and how to disentangle subsampling and finite size effects. Lastly, we apply subsampling scaling to neuronal avalanche models and to recordings from developing neural networks. We show that only mature, but not young networks follow power-law scaling, indicating self-organization to criticality during development.","lang":"eng"}],"publist_id":"6406","has_accepted_license":"1","oa_version":"Published Version","ddc":["005","571"],"publisher":"Nature Publishing Group","doi":"10.1038/ncomms15140","year":"2017","status":"public","title":"Subsampling scaling","author":[{"id":"35AF8020-F248-11E8-B48F-1D18A9856A87","full_name":"Levina (Martius), Anna","last_name":"Levina (Martius)","first_name":"Anna"},{"full_name":"Priesemann, Viola","first_name":"Viola","last_name":"Priesemann"}],"file_date_updated":"2020-07-14T12:48:19Z","type":"journal_article","date_published":"2017-05-04T00:00:00Z","quality_controlled":"1","language":[{"iso":"eng"}],"file":[{"content_type":"application/pdf","relation":"main_file","access_level":"open_access","checksum":"9880212f8c4c53404c7c6fbf9023c53a","file_name":"IST-2017-819-v1+1_2017_Levina_SubsamplingScaling.pdf","creator":"system","file_id":"5122","date_created":"2018-12-12T10:15:05Z","date_updated":"2020-07-14T12:48:19Z","file_size":746224}],"date_updated":"2023-09-22T09:54:07Z","external_id":{"isi":["000400560700001"]},"publication_identifier":{"issn":["20411723"]},"article_processing_charge":"Yes (in subscription journal)","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"month":"05","_id":"993"},{"article_processing_charge":"No","month":"08","_id":"994","issue":"3","external_id":{"isi":["000416564000004"]},"date_updated":"2023-09-22T09:53:42Z","quality_controlled":"1","date_published":"2017-08-08T00:00:00Z","language":[{"iso":"eng"}],"type":"journal_article","author":[{"id":"339C7E5A-F248-11E8-B48F-1D18A9856A87","full_name":"Cherepanov, Igor","last_name":"Cherepanov","first_name":"Igor"},{"full_name":"Lemeshko, Mikhail","last_name":"Lemeshko","first_name":"Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-6990-7802"}],"main_file_link":[{"url":"https://arxiv.org/abs/1705.09220","open_access":"1"}],"publisher":"American Physical Society","doi":"10.1103/PhysRevMaterials.1.035602","title":"Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules","status":"public","year":"2017","publist_id":"6405","oa_version":"Submitted Version","abstract":[{"text":"The formation of vortices is usually considered to be the main mechanism of angular momentum disposal in superfluids. Recently, it was predicted that a superfluid can acquire angular momentum via an alternative, microscopic route -- namely, through interaction with rotating impurities, forming so-called `angulon quasiparticles' [Phys. Rev. Lett. 114, 203001 (2015)]. The angulon instabilities correspond to transfer of a small number of angular momentum quanta from the impurity to the superfluid, as opposed to vortex instabilities, where angular momentum is quantized in units of ℏ per atom. Furthermore, since conventional impurities (such as molecules) represent three-dimensional (3D) rotors, the angular momentum transferred is intrinsically 3D as well, as opposed to a merely planar rotation which is inherent to vortices. Herein we show that the angulon theory can explain the anomalous broadening of the spectroscopic lines observed for CH 3 and NH 3 molecules in superfluid helium nanodroplets, thereby providing a fingerprint of the emerging angulon instabilities in experiment.","lang":"eng"}],"publication_status":"published","project":[{"call_identifier":"FWF","name":"Quantum rotations in the presence of a many-body environment","grant_number":"P29902","_id":"26031614-B435-11E9-9278-68D0E5697425"},{"grant_number":"665385","name":"International IST Doctoral Program","_id":"2564DBCA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"date_created":"2018-12-11T11:49:35Z","intvolume":" 1","volume":1,"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","isi":1,"day":"08","scopus_import":"1","department":[{"_id":"MiLe"}],"citation":{"mla":"Cherepanov, Igor, and Mikhail Lemeshko. “Fingerprints of Angulon Instabilities in the Spectra of Matrix-Isolated Molecules.” Physical Review Materials, vol. 1, no. 3, American Physical Society, 2017, doi:10.1103/PhysRevMaterials.1.035602.","chicago":"Cherepanov, Igor, and Mikhail Lemeshko. “Fingerprints of Angulon Instabilities in the Spectra of Matrix-Isolated Molecules.” Physical Review Materials. American Physical Society, 2017. https://doi.org/10.1103/PhysRevMaterials.1.035602.","apa":"Cherepanov, I., & Lemeshko, M. (2017). Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. American Physical Society. https://doi.org/10.1103/PhysRevMaterials.1.035602","ieee":"I. Cherepanov and M. Lemeshko, “Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules,” Physical Review Materials, vol. 1, no. 3. American Physical Society, 2017.","short":"I. Cherepanov, M. Lemeshko, Physical Review Materials 1 (2017).","ista":"Cherepanov I, Lemeshko M. 2017. Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. 1(3).","ama":"Cherepanov I, Lemeshko M. Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. 2017;1(3). doi:10.1103/PhysRevMaterials.1.035602"},"publication":"Physical Review Materials","ec_funded":1,"oa":1},{"oa":1,"department":[{"_id":"MiLe"}],"citation":{"chicago":"Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital Quantum Impurities Interacting with a Many-Particle Environment.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.085410.","mla":"Bighin, Giacomo, and Mikhail Lemeshko. “Diagrammatic Approach to Orbital Quantum Impurities Interacting with a Many-Particle Environment.” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 8, 085410, American Physical Society, 2017, doi:10.1103/PhysRevB.96.085410.","apa":"Bighin, G., & Lemeshko, M. (2017). Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.96.085410","ieee":"G. Bighin and M. Lemeshko, “Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment,” Physical Review B - Condensed Matter and Materials Physics, vol. 96, no. 8. American Physical Society, 2017.","ista":"Bighin G, Lemeshko M. 2017. Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. 96(8), 085410.","ama":"Bighin G, Lemeshko M. Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment. Physical Review B - Condensed Matter and Materials Physics. 2017;96(8). doi:10.1103/PhysRevB.96.085410","short":"G. Bighin, M. Lemeshko, Physical Review B - Condensed Matter and Materials Physics 96 (2017)."},"publication":"Physical Review B - Condensed Matter and Materials Physics","isi":1,"day":"07","scopus_import":"1","date_created":"2018-12-11T11:49:36Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","volume":96,"intvolume":" 96","article_number":"085410","project":[{"call_identifier":"FWF","grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","_id":"26031614-B435-11E9-9278-68D0E5697425"}],"abstract":[{"text":"Recently it was shown that an impurity exchanging orbital angular momentum with a surrounding bath can be described in terms of the angulon quasiparticle [Phys. Rev. Lett. 118, 095301 (2017)]. The angulon consists of a quantum rotor dressed by a many-particle field of boson excitations, and can be formed out of, for example, a molecule or a nonspherical atom in superfluid helium, or out of an electron coupled to lattice phonons or a Bose condensate. Here we develop an approach to the angulon based on the path-integral formalism, which sets the ground for a systematic, perturbative treatment of the angulon problem. The resulting perturbation series can be interpreted in terms of Feynman diagrams, from which, in turn, one can derive a set of diagrammatic rules. These rules extend the machinery of the graphical theory of angular momentum - well known from theoretical atomic spectroscopy - to the case where an environment with an infinite number of degrees of freedom is present. In particular, we show that each diagram can be interpreted as a 'skeleton', which enforces angular momentum conservation, dressed by an additional many-body contribution. This connection between the angulon theory and the graphical theory of angular momentum is particularly important as it allows to systematically and substantially simplify the analytical representation of each diagram. In order to exemplify the technique, we calculate the 1- and 2-loop contributions to the angulon self-energy, the spectral function, and the quasiparticle weight. The diagrammatic theory we develop paves the way to investigate next-to-leading order quantities in a more compact way compared to the variational approaches.","lang":"eng"}],"publication_status":"published","publist_id":"6404","oa_version":"Submitted Version","doi":"10.1103/PhysRevB.96.085410","publisher":"American Physical Society","status":"public","title":"Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment","year":"2017","author":[{"orcid":"0000-0001-8823-9777","id":"4CA96FD4-F248-11E8-B48F-1D18A9856A87","full_name":"Bighin, Giacomo","last_name":"Bighin","first_name":"Giacomo"},{"orcid":"0000-0002-6990-7802","last_name":"Lemeshko","first_name":"Mikhail","full_name":"Lemeshko, Mikhail","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87"}],"main_file_link":[{"url":"https://arxiv.org/abs/1704.02616","open_access":"1"}],"type":"journal_article","quality_controlled":"1","date_published":"2017-08-07T00:00:00Z","language":[{"iso":"eng"}],"issue":"8","external_id":{"isi":["000407017100009"]},"date_updated":"2023-09-22T09:53:17Z","publication_identifier":{"issn":["24699950"]},"month":"08","article_processing_charge":"No","_id":"995"},{"article_number":"013946","abstract":[{"text":"Iodine (I 2 ) molecules embedded in He nanodroplets are aligned by a 160 ps long laser pulse. The highest degree of alignment, occurring at the peak of the pulse and quantified by ⟨cos 2 θ 2D ⟩ , is measured as a function of the laser intensity. The results are well described by ⟨cos 2 θ 2D ⟩ calculated for a gas of isolated molecules each with an effective rotational constant of 0.6 times the gas-phase value, and at a temperature of 0.4 K. Theoretical analysis using the angulon quasiparticle to describe rotating molecules in superfluid helium rationalizes why the alignment mechanism is similar to that of isolated molecules with an effective rotational constant. A major advantage of molecules in He droplets is that their 0.4 K temperature leads to stronger alignment than what can generally be achieved for gas phase molecules -- here demonstrated by a direct comparison of the droplet results to measurements on a ∼ 1 K supersonic beam of isolated molecules. This point is further illustrated for more complex system by measurements on 1,4-diiodobenzene and 1,4-dibromobenzene. For all three molecular species studied the highest values of ⟨cos 2 θ 2D ⟩ achieved in He droplets exceed 0.96. ","lang":"eng"}],"publication_status":"published","date_created":"2018-12-11T11:49:36Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","volume":147,"intvolume":" 147","isi":1,"scopus_import":"1","day":"01","oa":1,"citation":{"mla":"Shepperson, Benjamin, et al. “Strongly Aligned Molecules inside Helium Droplets in the Near-Adiabatic Regime.” The Journal of Chemical Physics, vol. 147, no. 1, 013946, AIP Publishing, 2017, doi:10.1063/1.4983703.","chicago":"Shepperson, Benjamin, Adam Chatterley, Anders Søndergaard, Lars Christiansen, Mikhail Lemeshko, and Henrik Stapelfeldt. “Strongly Aligned Molecules inside Helium Droplets in the Near-Adiabatic Regime.” The Journal of Chemical Physics. AIP Publishing, 2017. https://doi.org/10.1063/1.4983703.","apa":"Shepperson, B., Chatterley, A., Søndergaard, A., Christiansen, L., Lemeshko, M., & Stapelfeldt, H. (2017). Strongly aligned molecules inside helium droplets in the near-adiabatic regime. The Journal of Chemical Physics. AIP Publishing. https://doi.org/10.1063/1.4983703","ieee":"B. Shepperson, A. Chatterley, A. Søndergaard, L. Christiansen, M. Lemeshko, and H. Stapelfeldt, “Strongly aligned molecules inside helium droplets in the near-adiabatic regime,” The Journal of Chemical Physics, vol. 147, no. 1. AIP Publishing, 2017.","short":"B. Shepperson, A. Chatterley, A. Søndergaard, L. Christiansen, M. Lemeshko, H. Stapelfeldt, The Journal of Chemical Physics 147 (2017).","ista":"Shepperson B, Chatterley A, Søndergaard A, Christiansen L, Lemeshko M, Stapelfeldt H. 2017. Strongly aligned molecules inside helium droplets in the near-adiabatic regime. The Journal of Chemical Physics. 147(1), 013946.","ama":"Shepperson B, Chatterley A, Søndergaard A, Christiansen L, Lemeshko M, Stapelfeldt H. Strongly aligned molecules inside helium droplets in the near-adiabatic regime. The Journal of Chemical Physics. 2017;147(1). doi:10.1063/1.4983703"},"department":[{"_id":"MiLe"}],"publication":"The Journal of Chemical Physics","publication_identifier":{"issn":["00219606"]},"month":"06","article_processing_charge":"No","_id":"996","quality_controlled":"1","date_published":"2017-06-01T00:00:00Z","language":[{"iso":"eng"}],"issue":"1","external_id":{"isi":["000405089400047"]},"date_updated":"2024-02-28T13:02:26Z","author":[{"last_name":"Shepperson","first_name":"Benjamin","full_name":"Shepperson, Benjamin"},{"full_name":"Chatterley, Adam","first_name":"Adam","last_name":"Chatterley"},{"first_name":"Anders","last_name":"Søndergaard","full_name":"Søndergaard, Anders"},{"first_name":"Lars","last_name":"Christiansen","full_name":"Christiansen, Lars"},{"orcid":"0000-0002-6990-7802","id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","full_name":"Lemeshko, Mikhail","first_name":"Mikhail","last_name":"Lemeshko"},{"first_name":"Henrik","last_name":"Stapelfeldt","full_name":"Stapelfeldt, Henrik"}],"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1704.03684"}],"type":"journal_article","publist_id":"6403","oa_version":"Submitted Version","doi":"10.1063/1.4983703","publisher":"AIP Publishing","status":"public","title":"Strongly aligned molecules inside helium droplets in the near-adiabatic regime","year":"2017"},{"publication":"Physical Review Letters","citation":{"mla":"Yakaboylu, Enderalp, et al. “Emergence of Non-Abelian Magnetic Monopoles in a Quantum Impurity Problem.” Physical Review Letters, vol. 119, no. 23, 235301, American Physical Society, 2017, doi:10.1103/PhysRevLett.119.235301.","chicago":"Yakaboylu, Enderalp, Andreas Deuchert, and Mikhail Lemeshko. “Emergence of Non-Abelian Magnetic Monopoles in a Quantum Impurity Problem.” Physical Review Letters. American Physical Society, 2017. https://doi.org/10.1103/PhysRevLett.119.235301.","ieee":"E. Yakaboylu, A. Deuchert, and M. Lemeshko, “Emergence of non-abelian magnetic monopoles in a quantum impurity problem,” Physical Review Letters, vol. 119, no. 23. American Physical Society, 2017.","apa":"Yakaboylu, E., Deuchert, A., & Lemeshko, M. (2017). Emergence of non-abelian magnetic monopoles in a quantum impurity problem. Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.119.235301","short":"E. Yakaboylu, A. Deuchert, M. Lemeshko, Physical Review Letters 119 (2017).","ista":"Yakaboylu E, Deuchert A, Lemeshko M. 2017. Emergence of non-abelian magnetic monopoles in a quantum impurity problem. Physical Review Letters. 119(23), 235301.","ama":"Yakaboylu E, Deuchert A, Lemeshko M. Emergence of non-abelian magnetic monopoles in a quantum impurity problem. Physical Review Letters. 2017;119(23). doi:10.1103/PhysRevLett.119.235301"},"department":[{"_id":"MiLe"},{"_id":"RoSe"}],"oa":1,"ec_funded":1,"scopus_import":"1","day":"06","isi":1,"intvolume":" 119","volume":119,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2018-12-11T11:49:36Z","abstract":[{"text":"Recently it was shown that molecules rotating in superfluid helium can be described in terms of the angulon quasiparticles (Phys. Rev. Lett. 118, 095301 (2017)). Here we demonstrate that in the experimentally realized regime the angulon can be seen as a point charge on a 2-sphere interacting with a gauge field of a non-abelian magnetic monopole. Unlike in several other settings, the gauge fields of the angulon problem emerge in the real coordinate space, as opposed to the momentum space or some effective parameter space. Furthermore, we find a topological transition associated with making the monopole abelian, which takes place in the vicinity of the previously reported angulon instabilities. These results pave the way for studying topological phenomena in experiments on molecules trapped in superfluid helium nanodroplets, as well as on other realizations of orbital impurity problems.","lang":"eng"}],"publication_status":"published","project":[{"_id":"25681D80-B435-11E9-9278-68D0E5697425","grant_number":"291734","name":"International IST Postdoc Fellowship Programme","call_identifier":"FP7"},{"name":"Analysis of quantum many-body systems","_id":"25C6DC12-B435-11E9-9278-68D0E5697425","grant_number":"694227","call_identifier":"H2020"},{"grant_number":"P29902","name":"Quantum rotations in the presence of a many-body environment","_id":"26031614-B435-11E9-9278-68D0E5697425","call_identifier":"FWF"}],"article_number":"235301","arxiv":1,"year":"2017","title":"Emergence of non-abelian magnetic monopoles in a quantum impurity problem","status":"public","publisher":"American Physical Society","doi":"10.1103/PhysRevLett.119.235301","publist_id":"6401","oa_version":"Preprint","type":"journal_article","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1705.05162"}],"author":[{"id":"38CB71F6-F248-11E8-B48F-1D18A9856A87","first_name":"Enderalp","last_name":"Yakaboylu","full_name":"Yakaboylu, Enderalp","orcid":"0000-0001-5973-0874"},{"orcid":"0000-0003-3146-6746","full_name":"Deuchert, Andreas","first_name":"Andreas","last_name":"Deuchert","id":"4DA65CD0-F248-11E8-B48F-1D18A9856A87"},{"id":"37CB05FA-F248-11E8-B48F-1D18A9856A87","last_name":"Lemeshko","first_name":"Mikhail","full_name":"Lemeshko, Mikhail","orcid":"0000-0002-6990-7802"}],"external_id":{"isi":["000417132100007"],"arxiv":["1705.05162"]},"date_updated":"2023-10-10T13:31:54Z","article_type":"original","issue":"23","language":[{"iso":"eng"}],"date_published":"2017-12-06T00:00:00Z","quality_controlled":"1","_id":"997","article_processing_charge":"No","month":"12","publication_identifier":{"issn":["0031-9007"]}},{"publication_identifier":{"isbn":["978-153860457-1"]},"month":"04","article_processing_charge":"No","_id":"998","quality_controlled":"1","date_published":"2017-04-14T00:00:00Z","language":[{"iso":"eng"}],"page":"5533 - 5542","external_id":{"isi":["000418371405066"]},"date_updated":"2023-09-22T09:51:58Z","author":[{"first_name":"Sylvestre Alvise","last_name":"Rebuffi","full_name":"Rebuffi, Sylvestre Alvise"},{"full_name":"Kolesnikov, Alexander","first_name":"Alexander","last_name":"Kolesnikov","id":"2D157DB6-F248-11E8-B48F-1D18A9856A87"},{"id":"4DD40360-F248-11E8-B48F-1D18A9856A87","last_name":"Sperl","first_name":"Georg","full_name":"Sperl, Georg"},{"orcid":"0000-0001-8622-7887","id":"40C20FD2-F248-11E8-B48F-1D18A9856A87","full_name":"Lampert, Christoph","last_name":"Lampert","first_name":"Christoph"}],"main_file_link":[{"url":"https://arxiv.org/abs/1611.07725","open_access":"1"}],"type":"conference","conference":{"start_date":"2017-07-21","name":"CVPR: Computer Vision and Pattern Recognition","end_date":"2017-07-26","location":"Honolulu, HA, United States"},"publist_id":"6400","oa_version":"Submitted Version","doi":"10.1109/CVPR.2017.587","publisher":"IEEE","title":"iCaRL: Incremental classifier and representation learning","status":"public","year":"2017","project":[{"call_identifier":"FP7","_id":"2532554C-B435-11E9-9278-68D0E5697425","grant_number":"308036","name":"Lifelong Learning of Visual Scene Understanding"}],"publication_status":"published","abstract":[{"text":"A major open problem on the road to artificial intelligence is the development of incrementally learning systems that learn about more and more concepts over time from a stream of data. In this work, we introduce a new training strategy, iCaRL, that allows learning in such a class-incremental way: only the training data for a small number of classes has to be present at the same time and new classes can be added progressively. iCaRL learns strong classifiers and a data representation simultaneously. This distinguishes it from earlier works that were fundamentally limited to fixed data representations and therefore incompatible with deep learning architectures. We show by experiments on CIFAR-100 and ImageNet ILSVRC 2012 data that iCaRL can learn many classes incrementally over a long period of time where other strategies quickly fail. ","lang":"eng"}],"date_created":"2018-12-11T11:49:37Z","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","volume":2017,"intvolume":" 2017","isi":1,"scopus_import":"1","day":"14","oa":1,"ec_funded":1,"citation":{"apa":"Rebuffi, S. A., Kolesnikov, A., Sperl, G., & Lampert, C. (2017). iCaRL: Incremental classifier and representation learning (Vol. 2017, pp. 5533–5542). Presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States: IEEE. https://doi.org/10.1109/CVPR.2017.587","ieee":"S. A. Rebuffi, A. Kolesnikov, G. Sperl, and C. Lampert, “iCaRL: Incremental classifier and representation learning,” presented at the CVPR: Computer Vision and Pattern Recognition, Honolulu, HA, United States, 2017, vol. 2017, pp. 5533–5542.","mla":"Rebuffi, Sylvestre Alvise, et al. ICaRL: Incremental Classifier and Representation Learning. Vol. 2017, IEEE, 2017, pp. 5533–42, doi:10.1109/CVPR.2017.587.","chicago":"Rebuffi, Sylvestre Alvise, Alexander Kolesnikov, Georg Sperl, and Christoph Lampert. “ICaRL: Incremental Classifier and Representation Learning,” 2017:5533–42. IEEE, 2017. https://doi.org/10.1109/CVPR.2017.587.","short":"S.A. Rebuffi, A. Kolesnikov, G. Sperl, C. Lampert, in:, IEEE, 2017, pp. 5533–5542.","ista":"Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. 2017. iCaRL: Incremental classifier and representation learning. CVPR: Computer Vision and Pattern Recognition vol. 2017, 5533–5542.","ama":"Rebuffi SA, Kolesnikov A, Sperl G, Lampert C. iCaRL: Incremental classifier and representation learning. In: Vol 2017. IEEE; 2017:5533-5542. doi:10.1109/CVPR.2017.587"},"department":[{"_id":"ChLa"},{"_id":"ChWo"}]},{"day":"08","alternative_title":["PMLR"],"scopus_import":"1","isi":1,"oa":1,"ec_funded":1,"citation":{"ama":"Pentina A, Lampert C. Multi-task learning with labeled and unlabeled tasks. In: Vol 70. ML Research Press; 2017:2807-2816.","ista":"Pentina A, Lampert C. 2017. Multi-task learning with labeled and unlabeled tasks. ICML: International Conference on Machine Learning, PMLR, vol. 70, 2807–2816.","short":"A. Pentina, C. Lampert, in:, ML Research Press, 2017, pp. 2807–2816.","chicago":"Pentina, Anastasia, and Christoph Lampert. “Multi-Task Learning with Labeled and Unlabeled Tasks,” 70:2807–16. ML Research Press, 2017.","mla":"Pentina, Anastasia, and Christoph Lampert. Multi-Task Learning with Labeled and Unlabeled Tasks. Vol. 70, ML Research Press, 2017, pp. 2807–16.","apa":"Pentina, A., & Lampert, C. (2017). Multi-task learning with labeled and unlabeled tasks (Vol. 70, pp. 2807–2816). Presented at the ICML: International Conference on Machine Learning, Sydney, Australia: ML Research Press.","ieee":"A. Pentina and C. Lampert, “Multi-task learning with labeled and unlabeled tasks,” presented at the ICML: International Conference on Machine Learning, Sydney, Australia, 2017, vol. 70, pp. 2807–2816."},"department":[{"_id":"ChLa"}],"project":[{"_id":"2532554C-B435-11E9-9278-68D0E5697425","grant_number":"308036","name":"Lifelong Learning of Visual Scene Understanding","call_identifier":"FP7"}],"abstract":[{"text":"In multi-task learning, a learner is given a collection of prediction tasks and needs to solve all of them. In contrast to previous work, which required that annotated training data must be available for all tasks, we consider a new setting, in which for some tasks, potentially most of them, only unlabeled training data is provided. Consequently, to solve all tasks, information must be transferred between tasks with labels and tasks without labels. Focusing on an instance-based transfer method we analyze two variants of this setting: when the set of labeled tasks is fixed, and when it can be actively selected by the learner. We state and prove a generalization bound that covers both scenarios and derive from it an algorithm for making the choice of labeled tasks (in the active case) and for transferring information between the tasks in a principled way. We also illustrate the effectiveness of the algorithm on synthetic and real data. ","lang":"eng"}],"publication_status":"published","intvolume":" 70","volume":70,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2018-12-11T11:49:37Z","main_file_link":[{"url":"https://arxiv.org/abs/1602.06518","open_access":"1"}],"author":[{"full_name":"Pentina, Anastasia","first_name":"Anastasia","last_name":"Pentina","id":"42E87FC6-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0001-8622-7887","id":"40C20FD2-F248-11E8-B48F-1D18A9856A87","first_name":"Christoph","last_name":"Lampert","full_name":"Lampert, Christoph"}],"conference":{"location":"Sydney, Australia","end_date":"2017-08-11","name":"ICML: International Conference on Machine Learning","start_date":"2017-08-06"},"type":"conference","oa_version":"Submitted Version","publist_id":"6399","year":"2017","title":"Multi-task learning with labeled and unlabeled tasks","status":"public","publisher":"ML Research Press","publication_identifier":{"isbn":["9781510855144"]},"_id":"999","article_processing_charge":"No","month":"06","language":[{"iso":"eng"}],"date_published":"2017-06-08T00:00:00Z","quality_controlled":"1","date_updated":"2023-10-17T11:53:32Z","external_id":{"isi":["000683309502093"]},"page":"2807 - 2816"},{"day":"10","citation":{"mla":"Coughlan, Claudia, et al. “Compound Copper Chalcogenide Nanocrystals.” Chemical Reviews, vol. 117, no. 9, American Chemical Society, 2017, pp. 5865–6109, doi:10.1021/acs.chemrev.6b00376.","chicago":"Coughlan, Claudia, Maria Ibáñez, Oleksandr Dobrozhan, Ajay Singh, Andreu Cabot, and Kevin Ryan. “Compound Copper Chalcogenide Nanocrystals.” Chemical Reviews. American Chemical Society, 2017. https://doi.org/10.1021/acs.chemrev.6b00376.","apa":"Coughlan, C., Ibáñez, M., Dobrozhan, O., Singh, A., Cabot, A., & Ryan, K. (2017). Compound copper chalcogenide nanocrystals. Chemical Reviews. American Chemical Society. https://doi.org/10.1021/acs.chemrev.6b00376","ieee":"C. Coughlan, M. Ibáñez, O. Dobrozhan, A. Singh, A. Cabot, and K. Ryan, “Compound copper chalcogenide nanocrystals,” Chemical Reviews, vol. 117, no. 9. American Chemical Society, pp. 5865–6109, 2017.","short":"C. Coughlan, M. Ibáñez, O. Dobrozhan, A. Singh, A. Cabot, K. Ryan, Chemical Reviews 117 (2017) 5865–6109.","ista":"Coughlan C, Ibáñez M, Dobrozhan O, Singh A, Cabot A, Ryan K. 2017. Compound copper chalcogenide nanocrystals. Chemical Reviews. 117(9), 5865–6109.","ama":"Coughlan C, Ibáñez M, Dobrozhan O, Singh A, Cabot A, Ryan K. Compound copper chalcogenide nanocrystals. Chemical Reviews. 2017;117(9):5865-6109. doi:10.1021/acs.chemrev.6b00376"},"publication":"Chemical Reviews","publication_status":"published","abstract":[{"lang":"eng","text":"This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), energy storage (lithium-ion batteries, hydrogen generation), emissive materials (plasmonics, LEDs, biolabelling), sensors (electrochemical, biochemical), biomedical devices (magnetic resonance imaging, X-ray computer tomography), and medical therapies (photochemothermal therapies, immunotherapy, radiotherapy, and drug delivery). The confluence of advances in the synthesis, assembly, and application of these NCs in the past decade has the potential to significantly impact society, both economically and environmentally. "}],"extern":"1","pmid":1,"date_created":"2018-12-11T11:46:06Z","intvolume":" 117","volume":117,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","type":"journal_article","author":[{"full_name":"Coughlan, Claudia","first_name":"Claudia","last_name":"Coughlan"},{"orcid":"0000-0001-5013-2843","last_name":"Ibanez Sabate","first_name":"Maria","full_name":"Ibanez Sabate, Maria","id":"43C61214-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Dobrozhan, Oleksandr","last_name":"Dobrozhan","first_name":"Oleksandr"},{"full_name":"Singh, Ajay","last_name":"Singh","first_name":"Ajay"},{"first_name":"Andreu","last_name":"Cabot","full_name":"Cabot, Andreu"},{"last_name":"Ryan","first_name":"Kevin","full_name":"Ryan, Kevin"}],"publisher":"American Chemical Society","doi":"10.1021/acs.chemrev.6b00376","title":"Compound copper chalcogenide nanocrystals","year":"2017","status":"public","acknowledgement":"C.C. and K.M.R. gratefully acknowledge support from Science Foundation Ireland (SFI) under the Principal Investigator Program under Contract No. 11PI-1148. This work was conducted under the framework of the Irish Government’s Programme for Research in Third Level Institutions Cycle 5, National Development Plan 2007−2013 with the assistance of the European Regional Development Fund. A.S. gratefully acknowledges Director’s Postdoctoral Fellowship support from the Los Alamos National Laboratory. M.I., O.D., and A.C. gratefully acknowledge support from the European Regional Development Funds and the Spanish MINECO Project BOOSTER (ENE2013-46624-C4-3-R). M.I. and O.D. thank AGAUR for their Beatriu de Pinós postdoctoral grant (2013 BP-A00344) and Ph.D. grant (2015 FI-B00810, 2016 FI-B100067), respectively.","oa_version":"None","publist_id":"7456","article_processing_charge":"No","month":"04","_id":"373","publication_identifier":{"issn":["0009-2665"],"eissn":["1520-6890"]},"issue":"9","page":"5865 - 6109","date_updated":"2024-03-05T12:17:59Z","external_id":{"pmid":["28394585"]},"article_type":"review","date_published":"2017-04-10T00:00:00Z","quality_controlled":"1","language":[{"iso":"eng"}]},{"pmid":1,"extern":"1","date_created":"2018-12-11T11:46:06Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":" 46","volume":46,"abstract":[{"text":"The conversion of thermal energy to electricity and vice versa by means of solid state thermoelectric devices is extremely appealing. However, its cost-effectiveness is seriously hampered by the relatively high production cost and low efficiency of current thermoelectric materials and devices. To overcome present challenges and enable a successful deployment of thermoelectric systems in their wide application range, materials with significantly improved performance need to be developed. Nanostructuration can help in several ways to reach the very particular group of properties required to achieve high thermoelectric performances. Nanodomains inserted within a crystalline matrix can provide large charge carrier concentrations without strongly influencing their mobility, thus allowing to reach very high electrical conductivities. Nanostructured materials contain numerous grain boundaries that efficiently scatter mid- and long-wavelength phonons thus reducing the thermal conductivity. Furthermore, nanocrystalline domains can enhance the Seebeck coefficient by modifying the density of states and/or providing type- and energy-dependent charge carrier scattering. All these advantages can only be reached when engineering a complex type of material, nanocomposites, with exquisite control over structural and chemical parameters at multiple length scales. Since current conventional nanomaterial production technologies lack such level of control, alternative strategies need to be developed and adjusted to the specifics of the field. A particularly suitable approach to produce nanocomposites with unique level of control over their structural and compositional parameters is their bottom-up engineering from solution-processed nanoparticles. In this work, we review the state-of-the-art of this technology applied to the thermoelectric field, including the synthesis of nanoparticles of suitable materials with precisely engineered composition and surface chemistry, their combination and consolidation into nanostructured materials, the strategies to electronically dope such materials and the attempts to fabricate thermoelectric devices using nanoparticle-based nanopowders and inks.","lang":"eng"}],"publication_status":"published","citation":{"ista":"Ortega S, Ibáñez M, Liu Y, Zhang Y, Kovalenko M, Cadavid D, Cabot A. 2017. Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks. Chemical Society Reviews. 46(12), 3510–3528.","ama":"Ortega S, Ibáñez M, Liu Y, et al. Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks. Chemical Society Reviews. 2017;46(12):3510-3528. doi:10.1039/c6cs00567e","short":"S. Ortega, M. Ibáñez, Y. Liu, Y. Zhang, M. Kovalenko, D. Cadavid, A. Cabot, Chemical Society Reviews 46 (2017) 3510–3528.","chicago":"Ortega, Silvia, Maria Ibáñez, Yu Liu, Yu Zhang, Maksym Kovalenko, Doris Cadavid, and Andreu Cabot. “Bottom up Engineering of Thermoelectric Nanomaterials and Devices from Solution Processed Nanoparticle Building Blocks.” Chemical Society Reviews. Royal Society of Chemistry, 2017. https://doi.org/10.1039/c6cs00567e.","mla":"Ortega, Silvia, et al. “Bottom up Engineering of Thermoelectric Nanomaterials and Devices from Solution Processed Nanoparticle Building Blocks.” Chemical Society Reviews, vol. 46, no. 12, Royal Society of Chemistry, 2017, pp. 3510–28, doi:10.1039/c6cs00567e.","ieee":"S. Ortega et al., “Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks,” Chemical Society Reviews, vol. 46, no. 12. Royal Society of Chemistry, pp. 3510–3528, 2017.","apa":"Ortega, S., Ibáñez, M., Liu, Y., Zhang, Y., Kovalenko, M., Cadavid, D., & Cabot, A. (2017). Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks. Chemical Society Reviews. Royal Society of Chemistry. https://doi.org/10.1039/c6cs00567e"},"publication":"Chemical Society Reviews","day":"21","issue":"12","page":"3510 - 3528","article_type":"original","date_updated":"2024-03-05T12:21:43Z","external_id":{"pmid":["28470243"]},"quality_controlled":"1","date_published":"2017-06-21T00:00:00Z","language":[{"iso":"eng"}],"month":"06","article_processing_charge":"No","_id":"374","publication_identifier":{"issn":["0306-0012"],"eissn":["1460-4744"]},"doi":"10.1039/c6cs00567e","publisher":"Royal Society of Chemistry","acknowledgement":"This work was supported by the European Regional Development Funds, the Spanish Ministerio de Econom?a y Competitividad through the projects BOOSTER (ENE2013-46624-C4-3-R) and SEHTOP (ENE2016-77798-C4-3-R). S. O. thanks AGAUR her PhD grant. Y. L. and Y. Z. thank the China Scholarship Council for scholarship support. M. I. acknowledges financial support by ETH Carrier Seed Grant (SEED-18 16-2) and M. V. K. acknowledges partial financial support by the European Union (EU) via FP7 ERC Starting Grant 2012 (Project NANOSOLID, GA No. 306733).","year":"2017","status":"public","title":"Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks","oa_version":"None","publist_id":"7454","type":"journal_article","author":[{"full_name":"Ortega, Silvia","last_name":"Ortega","first_name":"Silvia"},{"orcid":"0000-0001-5013-2843","id":"43C61214-F248-11E8-B48F-1D18A9856A87","last_name":"Ibanez Sabate","first_name":"Maria","full_name":"Ibanez Sabate, Maria"},{"id":"2A70014E-F248-11E8-B48F-1D18A9856A87","first_name":"Yu","last_name":"Liu","full_name":"Liu, Yu","orcid":"0000-0001-7313-6740"},{"full_name":"Zhang, Yu","first_name":"Yu","last_name":"Zhang"},{"full_name":"Kovalenko, Maksym","first_name":"Maksym","last_name":"Kovalenko"},{"last_name":"Cadavid","first_name":"Doris","full_name":"Cadavid, Doris"},{"first_name":"Andreu","last_name":"Cabot","full_name":"Cabot, Andreu"}]},{"oa_version":"None","publist_id":"7455","doi":"10.1021/acs.chemmater.7b00896","publisher":"American Chemical Society","acknowledgement":"This work was supported by the European Regional Development Funds and the Spanish MINECO project BOOSTER. T.B. is grateful for the FI-AGAUR Research Fellowship Program, Generalitat de Catalunya (2015 FI_B 00744). P.G. acknowledges the People Programme (Marie Curie Actions) of the FP7/2007-2013 European Union Program (TECNIOspring Grant Agreement No. 600388) and the Agency for Business Competitiveness of the Government of Catalonia, ACCIÓ. M.I. thanks AGAUR for Beatriu de Pinós postdoctoral grant (2013 BP-A00344). Z.L. thanks the China Scholarship Council for scholarship support.","title":"Tuning branching in ceria nanocrystals","status":"public","year":"2017","author":[{"first_name":"Taisiia","last_name":"Berestok","full_name":"Berestok, Taisiia"},{"last_name":"Guardia","first_name":"Pablo","full_name":"Guardia, Pablo"},{"last_name":"Blanco","first_name":"Javier","full_name":"Blanco, Javier"},{"last_name":"Nafria","first_name":"Raquel","full_name":"Nafria, Raquel"},{"full_name":"Torruella, Pau","last_name":"Torruella","first_name":"Pau"},{"full_name":"López Conesa, Luis","first_name":"Luis","last_name":"López Conesa"},{"last_name":"Estradé","first_name":"Sònia","full_name":"Estradé, Sònia"},{"id":"43C61214-F248-11E8-B48F-1D18A9856A87","last_name":"Ibanez Sabate","first_name":"Maria","full_name":"Ibanez Sabate, Maria","orcid":"0000-0001-5013-2843"},{"full_name":"De Roo, Jonathan","last_name":"De Roo","first_name":"Jonathan"},{"last_name":"Luo","first_name":"Zhishan","full_name":"Luo, Zhishan"},{"first_name":"Doris","last_name":"Cadavid","full_name":"Cadavid, Doris"},{"first_name":"José","last_name":"Martins","full_name":"Martins, José"},{"last_name":"Kovalenko","first_name":"Maksym","full_name":"Kovalenko, Maksym"},{"last_name":"Peiró","first_name":"Francesca","full_name":"Peiró, Francesca"},{"last_name":"Cabot","first_name":"Andreu","full_name":"Cabot, Andreu"}],"type":"journal_article","date_published":"2017-04-24T00:00:00Z","quality_controlled":"1","language":[{"iso":"eng"}],"issue":"10","page":"4418 - 4424","article_type":"original","date_updated":"2024-03-05T12:19:17Z","publication_identifier":{"eissn":["1520-5002"],"issn":["0897-4756"]},"month":"04","article_processing_charge":"No","_id":"375","citation":{"chicago":"Berestok, Taisiia, Pablo Guardia, Javier Blanco, Raquel Nafria, Pau Torruella, Luis López Conesa, Sònia Estradé, et al. “Tuning Branching in Ceria Nanocrystals.” Chemistry of Materials. American Chemical Society, 2017. https://doi.org/10.1021/acs.chemmater.7b00896.","mla":"Berestok, Taisiia, et al. “Tuning Branching in Ceria Nanocrystals.” Chemistry of Materials, vol. 29, no. 10, American Chemical Society, 2017, pp. 4418–24, doi:10.1021/acs.chemmater.7b00896.","ieee":"T. Berestok et al., “Tuning branching in ceria nanocrystals,” Chemistry of Materials, vol. 29, no. 10. American Chemical Society, pp. 4418–4424, 2017.","apa":"Berestok, T., Guardia, P., Blanco, J., Nafria, R., Torruella, P., López Conesa, L., … Cabot, A. (2017). Tuning branching in ceria nanocrystals. Chemistry of Materials. American Chemical Society. https://doi.org/10.1021/acs.chemmater.7b00896","ama":"Berestok T, Guardia P, Blanco J, et al. Tuning branching in ceria nanocrystals. Chemistry of Materials. 2017;29(10):4418-4424. doi:10.1021/acs.chemmater.7b00896","ista":"Berestok T, Guardia P, Blanco J, Nafria R, Torruella P, López Conesa L, Estradé S, Ibáñez M, De Roo J, Luo Z, Cadavid D, Martins J, Kovalenko M, Peiró F, Cabot A. 2017. Tuning branching in ceria nanocrystals. Chemistry of Materials. 29(10), 4418–4424.","short":"T. Berestok, P. Guardia, J. Blanco, R. Nafria, P. Torruella, L. López Conesa, S. Estradé, M. Ibáñez, J. De Roo, Z. Luo, D. Cadavid, J. Martins, M. Kovalenko, F. Peiró, A. Cabot, Chemistry of Materials 29 (2017) 4418–4424."},"publication":"Chemistry of Materials","day":"24","date_created":"2018-12-11T11:46:07Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":" 29","volume":29,"extern":"1","publication_status":"published","abstract":[{"text":"Branched nanocrystals (NCs) enable high atomic surface exposure within a crystalline network that provides avenues for charge transport. This combination of properties makes branched NCs particularly suitable for a range of applications where both interaction with the media and charge transport are involved. Herein we report on the colloidal synthesis of branched ceria NCs by means of a ligand-mediated overgrowth mechanism. In particular, the differential coverage of oleic acid as an X-type ligand at ceria facets with different atomic density, atomic coordination deficiency, and oxygen vacancy density resulted in a preferential growth in the [111] direction and thus in the formation of ceria octapods. Alcohols, through an esterification alcoholysis reaction, promoted faster growth rates that translated into nanostructures with higher geometrical complexity, increasing the branch aspect ratio and triggering the formation of side branches. On the other hand, the presence of water resulted in a significant reduction of the growth rate, decreasing the reaction yield and eliminating side branching, which we associate to a blocking of the surface reaction sites or a displacement of the alcoholysis reaction. Overall, adjusting the amounts of each chemical, well-defined branched ceria NCs with tuned number, thickness, and length of branches and with overall size ranging from 5 to 45 nm could be produced. We further demonstrate that such branched ceria NCs are able to provide higher surface areas and related oxygen storage capacities (OSC) than quasi-spherical NCs.\r\n\r\n","lang":"eng"}]},{"_id":"391","month":"02","abstract":[{"lang":"eng","text":"Three-dimensional topological insulators are bulk insulators with Z 2 topological electronic order that gives rise to conducting light-like surface states. These surface electrons are exceptionally resistant to localization by non-magnetic disorder, and have been adopted as the basis for a wide range of proposals to achieve new quasiparticle species and device functionality. Recent studies have yielded a surprise by showing that in spite of resisting localization, topological insulator surface electrons can be reshaped by defects into distinctive resonance states. Here we use numerical simulations and scanning tunnelling microscopy data to show that these resonance states have significance well beyond the localized regime usually associated with impurity bands. At native densities in the model Bi2X3 (X=Bi, Te) compounds, defect resonance states are predicted to generate a new quantum basis for an emergent electron gas that supports diffusive electrical transport. "}],"publication_status":"published","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","language":[{"iso":"eng"}],"volume":8,"intvolume":" 8","date_published":"2017-02-03T00:00:00Z","date_created":"2018-12-11T11:46:12Z","date_updated":"2021-01-12T07:53:08Z","extern":"1","author":[{"last_name":"Xu","first_name":"Yishuai","full_name":"Xu, Yishuai"},{"last_name":"Chiu","first_name":"Janet","full_name":"Chiu, Janet"},{"last_name":"Miao","first_name":"Lin","full_name":"Miao, Lin"},{"full_name":"He, Haowei","first_name":"Haowei","last_name":"He"},{"id":"45E67A2A-F248-11E8-B48F-1D18A9856A87","last_name":"Alpichshev","first_name":"Zhanybek","full_name":"Alpichshev, Zhanybek","orcid":"0000-0002-7183-5203"},{"last_name":"Kapitulnik","first_name":"Aharon","full_name":"Kapitulnik, Aharon"},{"first_name":"Rudro","last_name":"Biswas","full_name":"Biswas, Rudro"},{"last_name":"Wray","first_name":"Lewis","full_name":"Wray, Lewis"}],"day":"03","type":"journal_article","oa_version":"None","publist_id":"7438","year":"2017","publication":"Nature Communications","status":"public","title":"Disorder enabled band structure engineering of a topological insulator surface","citation":{"short":"Y. Xu, J. Chiu, L. Miao, H. He, Z. Alpichshev, A. Kapitulnik, R. Biswas, L. Wray, Nature Communications 8 (2017).","ama":"Xu Y, Chiu J, Miao L, et al. Disorder enabled band structure engineering of a topological insulator surface. Nature Communications. 2017;8. doi:10.1038/ncomms14081","ista":"Xu Y, Chiu J, Miao L, He H, Alpichshev Z, Kapitulnik A, Biswas R, Wray L. 2017. Disorder enabled band structure engineering of a topological insulator surface. Nature Communications. 8.","apa":"Xu, Y., Chiu, J., Miao, L., He, H., Alpichshev, Z., Kapitulnik, A., … Wray, L. (2017). Disorder enabled band structure engineering of a topological insulator surface. Nature Communications. Nature Publishing Group. https://doi.org/10.1038/ncomms14081","ieee":"Y. Xu et al., “Disorder enabled band structure engineering of a topological insulator surface,” Nature Communications, vol. 8. Nature Publishing Group, 2017.","mla":"Xu, Yishuai, et al. “Disorder Enabled Band Structure Engineering of a Topological Insulator Surface.” Nature Communications, vol. 8, Nature Publishing Group, 2017, doi:10.1038/ncomms14081.","chicago":"Xu, Yishuai, Janet Chiu, Lin Miao, Haowei He, Zhanybek Alpichshev, Aharon Kapitulnik, Rudro Biswas, and Lewis Wray. “Disorder Enabled Band Structure Engineering of a Topological Insulator Surface.” Nature Communications. Nature Publishing Group, 2017. https://doi.org/10.1038/ncomms14081."},"doi":"10.1038/ncomms14081","publisher":"Nature Publishing Group"},{"oa":1,"oa_version":"None","publist_id":"7437","publisher":"American Physical Society","doi":"10.1103/PhysRevB.95.115125","citation":{"mla":"Vishik, Inna, et al. “Ultrafast Dynamics in the Presence of Antiferromagnetic Correlations in Electron Doped Cuprate La2 XCexCuO4±δ.” Physical Review B, vol. 95, no. 11, American Physical Society, 2017, doi:10.1103/PhysRevB.95.115125.","chicago":"Vishik, Inna, Fahad Mahmood, Zhanybek Alpichshev, Nuh Gedik, Joshu Higgins, and Richard Greene. “Ultrafast Dynamics in the Presence of Antiferromagnetic Correlations in Electron Doped Cuprate La2 XCexCuO4±δ.” Physical Review B. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.95.115125.","ieee":"I. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, and R. Greene, “Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ,” Physical Review B, vol. 95, no. 11. American Physical Society, 2017.","apa":"Vishik, I., Mahmood, F., Alpichshev, Z., Gedik, N., Higgins, J., & Greene, R. (2017). Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.95.115125","short":"I. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, R. Greene, Physical Review B 95 (2017).","ista":"Vishik I, Mahmood F, Alpichshev Z, Gedik N, Higgins J, Greene R. 2017. Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. 95(11).","ama":"Vishik I, Mahmood F, Alpichshev Z, Gedik N, Higgins J, Greene R. Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ. Physical Review B. 2017;95(11). doi:10.1103/PhysRevB.95.115125"},"publication":"Physical Review B","status":"public","year":"2017","title":"Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ","acknowledgement":"Optical pump-probe work was supported by the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF4540. Materials growth and characterization was supported by AFOSR FA95501410332 and NSF DMR1410665.","author":[{"full_name":"Vishik, Inna","first_name":"Inna","last_name":"Vishik"},{"full_name":"Mahmood, Fahad","first_name":"Fahad","last_name":"Mahmood"},{"id":"45E67A2A-F248-11E8-B48F-1D18A9856A87","full_name":"Alpichshev, Zhanybek","last_name":"Alpichshev","first_name":"Zhanybek","orcid":"0000-0002-7183-5203"},{"full_name":"Gedik, Nuh","last_name":"Gedik","first_name":"Nuh"},{"full_name":"Higgins, Joshu","first_name":"Joshu","last_name":"Higgins"},{"first_name":"Richard","last_name":"Greene","full_name":"Greene, Richard"}],"main_file_link":[{"open_access":"1","url":"http://dspace.mit.edu/handle/1721.1/109835"}],"type":"journal_article","day":"13","date_created":"2018-12-11T11:46:13Z","date_published":"2017-03-13T00:00:00Z","language":[{"iso":"eng"}],"intvolume":" 95","volume":95,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","issue":"11","extern":"1","date_updated":"2021-01-12T07:53:12Z","publication_status":"published","abstract":[{"text":"We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La2-xCexCuO4 (LCCO) with dopings of x=0.08 (underdoped) and x=0.11 (optimally doped). Above Tc, we observe fluence-dependent relaxation rates that begin at a temperature similar to the one where transport measurements first show signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates are consistent with bimolecular recombination of electrons and holes across a gap (2ΔAF) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy (ω>2ΔAF) excitations in these compounds and set limits on the time scales on which antiferromagnetic correlations are static.","lang":"eng"}],"month":"03","_id":"392"},{"type":"journal_article","day":"26","author":[{"id":"45E67A2A-F248-11E8-B48F-1D18A9856A87","full_name":"Alpichshev, Zhanybek","first_name":"Zhanybek","last_name":"Alpichshev","orcid":"0000-0002-7183-5203"},{"first_name":"Edbert","last_name":"Sie","full_name":"Sie, Edbert"},{"last_name":"Mahmood","first_name":"Fahad","full_name":"Mahmood, Fahad"},{"full_name":"Cao, Gang","first_name":"Gang","last_name":"Cao"},{"first_name":"Nuh","last_name":"Gedik","full_name":"Gedik, Nuh"}],"main_file_link":[{"url":"http://dspace.mit.edu/handle/1721.1/114259","open_access":"1"}],"doi":"10.1103/PhysRevB.96.235141","citation":{"short":"Z. Alpichshev, E. Sie, F. Mahmood, G. Cao, N. Gedik, Physical Review B 96 (2017).","ama":"Alpichshev Z, Sie E, Mahmood F, Cao G, Gedik N. Origin of the exciton mass in the frustrated Mott insulator Na2IrO3. Physical Review B. 2017;96(23). doi:10.1103/PhysRevB.96.235141","ista":"Alpichshev Z, Sie E, Mahmood F, Cao G, Gedik N. 2017. Origin of the exciton mass in the frustrated Mott insulator Na2IrO3. Physical Review B. 96(23).","mla":"Alpichshev, Zhanybek, et al. “Origin of the Exciton Mass in the Frustrated Mott Insulator Na2IrO3.” Physical Review B, vol. 96, no. 23, American Physical Society, 2017, doi:10.1103/PhysRevB.96.235141.","chicago":"Alpichshev, Zhanybek, Edbert Sie, Fahad Mahmood, Gang Cao, and Nuh Gedik. “Origin of the Exciton Mass in the Frustrated Mott Insulator Na2IrO3.” Physical Review B. American Physical Society, 2017. https://doi.org/10.1103/PhysRevB.96.235141.","ieee":"Z. Alpichshev, E. Sie, F. Mahmood, G. Cao, and N. Gedik, “Origin of the exciton mass in the frustrated Mott insulator Na2IrO3,” Physical Review B, vol. 96, no. 23. American Physical Society, 2017.","apa":"Alpichshev, Z., Sie, E., Mahmood, F., Cao, G., & Gedik, N. (2017). Origin of the exciton mass in the frustrated Mott insulator Na2IrO3. Physical Review B. American Physical Society. https://doi.org/10.1103/PhysRevB.96.235141"},"publisher":"American Physical Society","acknowledgement":"Z.A. gratefully acknowledges discussions with P. A. Lee and A. Kemper. A conversation with J. Zaanen was instrumental in clarifying the physical picture described in this paper. We would also like to thank A. Kogar for thoroughly reading the manuscript and making valuable comments. This work was supported by Army Research Office Grant No. W911NF-15-1-0128 and Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4540 (time resolved optical spectroscopy), Skoltech, as part of the Skoltech NGP program (theory) and National Science Foundation Grant No. DMR-1265162 (material growth).\r\n\r\n","publication":"Physical Review B","year":"2017","status":"public","title":"Origin of the exciton mass in the frustrated Mott insulator Na2IrO3","oa_version":"None","publist_id":"7436","oa":1,"abstract":[{"text":"We use a three-pulse ultrafast optical spectroscopy to study the relaxation processes in a frustrated Mott insulator Na2IrO3. By being able to independently produce the out-of-equilibrium bound states (excitons) of doublons and holons with the first pulse and suppress the underlying antiferromagnetic order with the second one, we were able to elucidate the relaxation mechanism of quasiparticles in this system. By observing the difference in the exciton dynamics in the magnetically ordered and disordered phases we found that the mass of this quasiparticle is mostly determined by its interaction with the surrounding spins. ","lang":"eng"}],"publication_status":"published","month":"12","_id":"393","extern":"1","issue":"23","date_updated":"2021-01-12T07:53:16Z","date_created":"2018-12-11T11:46:13Z","date_published":"2017-12-26T00:00:00Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","volume":96,"language":[{"iso":"eng"}],"intvolume":" 96"},{"date_created":"2018-12-11T11:46:24Z","user_id":"4435EBFC-F248-11E8-B48F-1D18A9856A87","editor":[{"first_name":"Martin","last_name":"Loebl","full_name":"Loebl, Martin"},{"full_name":"Nešetřil, Jaroslav","last_name":"Nešetřil","first_name":"Jaroslav"},{"full_name":"Thomas, Robin","first_name":"Robin","last_name":"Thomas"}],"publication_status":"published","abstract":[{"text":"We show that very weak topological assumptions are enough to ensure the existence of a Helly-type theorem. More precisely, we show that for any non-negative integers b and d there exists an integer h(b, d) such that the following holds. If F is a finite family of subsets of Rd such that βi(∩G)≤b for any G⊊F and every 0 ≤ i ≤ [d/2]-1 then F has Helly number at most h(b, d). Here βi denotes the reduced Z2-Betti numbers (with singular homology). These topological conditions are sharp: not controlling any of these [d/2] first Betti numbers allow for families with unbounded Helly number. Our proofs combine homological non-embeddability results with a Ramsey-based approach to build, given an arbitrary simplicial complex K, some well-behaved chain map C*(K)→C*(Rd).","lang":"eng"}],"oa":1,"citation":{"ista":"Goaoc X, Paták P, Patakova Z, Tancer M, Wagner U. 2017.Bounding helly numbers via betti numbers. In: A Journey through Discrete Mathematics: A Tribute to Jiri Matousek. , 407–447.","ama":"Goaoc X, Paták P, Patakova Z, Tancer M, Wagner U. Bounding helly numbers via betti numbers. In: Loebl M, Nešetřil J, Thomas R, eds. A Journey through Discrete Mathematics: A Tribute to Jiri Matousek. A Journey Through Discrete Mathematics. Springer; 2017:407-447. doi:10.1007/978-3-319-44479-6_17","short":"X. Goaoc, P. Paták, Z. Patakova, M. Tancer, U. Wagner, in:, M. Loebl, J. Nešetřil, R. Thomas (Eds.), A Journey through Discrete Mathematics: A Tribute to Jiri Matousek, Springer, 2017, pp. 407–447.","ieee":"X. Goaoc, P. Paták, Z. Patakova, M. Tancer, and U. Wagner, “Bounding helly numbers via betti numbers,” in A Journey through Discrete Mathematics: A Tribute to Jiri Matousek, M. Loebl, J. Nešetřil, and R. Thomas, Eds. Springer, 2017, pp. 407–447.","apa":"Goaoc, X., Paták, P., Patakova, Z., Tancer, M., & Wagner, U. (2017). Bounding helly numbers via betti numbers. In M. Loebl, J. Nešetřil, & R. Thomas (Eds.), A Journey through Discrete Mathematics: A Tribute to Jiri Matousek (pp. 407–447). Springer. https://doi.org/10.1007/978-3-319-44479-6_17","chicago":"Goaoc, Xavier, Pavel Paták, Zuzana Patakova, Martin Tancer, and Uli Wagner. “Bounding Helly Numbers via Betti Numbers.” In A Journey through Discrete Mathematics: A Tribute to Jiri Matousek, edited by Martin Loebl, Jaroslav Nešetřil, and Robin Thomas, 407–47. A Journey Through Discrete Mathematics. Springer, 2017. https://doi.org/10.1007/978-3-319-44479-6_17.","mla":"Goaoc, Xavier, et al. “Bounding Helly Numbers via Betti Numbers.” A Journey through Discrete Mathematics: A Tribute to Jiri Matousek, edited by Martin Loebl et al., Springer, 2017, pp. 407–47, doi:10.1007/978-3-319-44479-6_17."},"department":[{"_id":"UlWa"}],"publication":"A Journey through Discrete Mathematics: A Tribute to Jiri Matousek","related_material":{"record":[{"id":"1512","relation":"earlier_version","status":"public"}]},"scopus_import":1,"day":"06","date_published":"2017-10-06T00:00:00Z","quality_controlled":"1","language":[{"iso":"eng"}],"page":"407 - 447","series_title":"A Journey Through Discrete Mathematics","date_updated":"2024-02-28T12:59:37Z","publication_identifier":{"isbn":["978-331944479-6"]},"month":"10","_id":"424","publist_id":"7399","oa_version":"Published Version","doi":"10.1007/978-3-319-44479-6_17","publisher":"Springer","status":"public","year":"2017","title":"Bounding helly numbers via betti numbers","author":[{"full_name":"Goaoc, Xavier","last_name":"Goaoc","first_name":"Xavier"},{"first_name":"Pavel","last_name":"Paták","full_name":"Paták, Pavel"},{"last_name":"Patakova","first_name":"Zuzana","full_name":"Patakova, Zuzana","orcid":"0000-0002-3975-1683"},{"last_name":"Tancer","first_name":"Martin","full_name":"Tancer, Martin","orcid":"0000-0002-1191-6714"},{"last_name":"Wagner","first_name":"Uli","full_name":"Wagner, Uli","id":"36690CA2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1494-0568"}],"main_file_link":[{"url":"https://arxiv.org/abs/1310.4613v3","open_access":"1"}],"type":"book_chapter"},{"language":[{"iso":"eng"}],"date_published":"2017-01-01T00:00:00Z","quality_controlled":"1","date_updated":"2023-10-17T11:48:03Z","external_id":{"arxiv":["1610.02132"]},"page":"1710-1721","publication_identifier":{"issn":["10495258"]},"_id":"431","month":"01","article_processing_charge":"No","publist_id":"7392","oa_version":"Submitted Version","year":"2017","status":"public","title":"QSGD: Communication-efficient SGD via gradient quantization and encoding","publisher":"Neural Information Processing Systems Foundation","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1610.02132"}],"author":[{"id":"4A899BFC-F248-11E8-B48F-1D18A9856A87","full_name":"Alistarh, Dan-Adrian","first_name":"Dan-Adrian","last_name":"Alistarh","orcid":"0000-0003-3650-940X"},{"full_name":"Grubic, Demjan","last_name":"Grubic","first_name":"Demjan"},{"full_name":"Li, Jerry","last_name":"Li","first_name":"Jerry"},{"last_name":"Tomioka","first_name":"Ryota","full_name":"Tomioka, Ryota"},{"first_name":"Milan","last_name":"Vojnović","full_name":"Vojnović, Milan"}],"type":"conference","conference":{"location":"Long Beach, CA, United States","start_date":"2017-12-04","end_date":"2017-12-09","name":"NIPS: Neural Information Processing System"},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":" 2017","volume":2017,"date_created":"2018-12-11T11:46:26Z","arxiv":1,"publication_status":"published","abstract":[{"lang":"eng","text":"Parallel implementations of stochastic gradient descent (SGD) have received significant research attention, thanks to its excellent scalability properties. A fundamental barrier when parallelizing SGD is the high bandwidth cost of communicating gradient updates between nodes; consequently, several lossy compresion heuristics have been proposed, by which nodes only communicate quantized gradients. Although effective in practice, these heuristics do not always converge. In this paper, we propose Quantized SGD (QSGD), a family of compression schemes with convergence guarantees and good practical performance. QSGD allows the user to smoothly trade off communication bandwidth and convergence time: nodes can adjust the number of bits sent per iteration, at the cost of possibly higher variance. We show that this trade-off is inherent, in the sense that improving it past some threshold would violate information-theoretic lower bounds. QSGD guarantees convergence for convex and non-convex objectives, under asynchrony, and can be extended to stochastic variance-reduced techniques. When applied to training deep neural networks for image classification and automated speech recognition, QSGD leads to significant reductions in end-to-end training time. For instance, on 16GPUs, we can train the ResNet-152 network to full accuracy on ImageNet 1.8 × faster than the full-precision variant. "}],"oa":1,"citation":{"short":"D.-A. Alistarh, D. Grubic, J. Li, R. Tomioka, M. Vojnović, in:, Neural Information Processing Systems Foundation, 2017, pp. 1710–1721.","ista":"Alistarh D-A, Grubic D, Li J, Tomioka R, Vojnović M. 2017. QSGD: Communication-efficient SGD via gradient quantization and encoding. NIPS: Neural Information Processing System, Advances in Neural Information Processing Systems, vol. 2017, 1710–1721.","ama":"Alistarh D-A, Grubic D, Li J, Tomioka R, Vojnović M. QSGD: Communication-efficient SGD via gradient quantization and encoding. In: Vol 2017. Neural Information Processing Systems Foundation; 2017:1710-1721.","apa":"Alistarh, D.-A., Grubic, D., Li, J., Tomioka, R., & Vojnović, M. (2017). QSGD: Communication-efficient SGD via gradient quantization and encoding (Vol. 2017, pp. 1710–1721). Presented at the NIPS: Neural Information Processing System, Long Beach, CA, United States: Neural Information Processing Systems Foundation.","ieee":"D.-A. Alistarh, D. Grubic, J. Li, R. Tomioka, and M. Vojnović, “QSGD: Communication-efficient SGD via gradient quantization and encoding,” presented at the NIPS: Neural Information Processing System, Long Beach, CA, United States, 2017, vol. 2017, pp. 1710–1721.","mla":"Alistarh, Dan-Adrian, et al. QSGD: Communication-Efficient SGD via Gradient Quantization and Encoding. Vol. 2017, Neural Information Processing Systems Foundation, 2017, pp. 1710–21.","chicago":"Alistarh, Dan-Adrian, Demjan Grubic, Jerry Li, Ryota Tomioka, and Milan Vojnović. “QSGD: Communication-Efficient SGD via Gradient Quantization and Encoding,” 2017:1710–21. Neural Information Processing Systems Foundation, 2017."},"department":[{"_id":"DaAl"}],"day":"01","alternative_title":["Advances in Neural Information Processing Systems"]}]