--- _id: '988' abstract: - lang: eng 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. article_processing_charge: No author: - first_name: Gaurav full_name: Nanda, Gaurav last_name: Nanda - first_name: Juan L full_name: Aguilera Servin, Juan L id: 2A67C376-F248-11E8-B48F-1D18A9856A87 last_name: Aguilera Servin orcid: 0000-0002-2862-8372 - first_name: Péter full_name: Rakyta, Péter last_name: Rakyta - first_name: Andor full_name: Kormányos, Andor last_name: Kormányos - first_name: Reinhold full_name: Kleiner, Reinhold last_name: Kleiner - first_name: Dieter full_name: Koelle, Dieter last_name: Koelle - first_name: Kazuo full_name: Watanabe, Kazuo last_name: Watanabe - first_name: Takashi full_name: Taniguchi, Takashi last_name: Taniguchi - first_name: Lieven full_name: Vandersypen, Lieven last_name: Vandersypen - first_name: Srijit full_name: Goswami, Srijit last_name: Goswami citation: 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 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 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. 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. 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. 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. 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. date_created: 2018-12-11T11:49:33Z date_published: 2017-05-05T00:00:00Z date_updated: 2023-09-22T09:56:21Z day: '05' ddc: - '621' department: - _id: NanoFab doi: 10.1021/acs.nanolett.7b00097 external_id: isi: - '000403631600011' file: - access_level: open_access checksum: 22021daa90cf13b01becd776838acb7b content_type: application/pdf creator: system date_created: 2018-12-12T10:13:50Z date_updated: 2020-07-14T12:48:18Z file_id: '5037' file_name: IST-2017-826-v1+1_2017_Aguilera-Servin_Current.pdf file_size: 508638 relation: main_file file_date_updated: 2020-07-14T12:48:18Z has_accepted_license: '1' intvolume: ' 17' isi: 1 issue: '6' language: - iso: eng month: '05' oa: 1 oa_version: Published Version page: 3396 - 3401 publication: Nano Letters publication_identifier: issn: - '15306984' publication_status: published publisher: American Chemical Society publist_id: '6412' pubrep_id: '826' quality_controlled: '1' scopus_import: '1' status: public title: Current-phase relation of ballistic graphene Josephson junctions tmp: image: /images/cc_by_nc_nd.png legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) short: CC BY-NC-ND (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 17 year: '2017' ... --- _id: '989' abstract: - lang: eng 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. alternative_title: - LNCS article_processing_charge: No author: - first_name: Jan full_name: Maas, Jan id: 4C5696CE-F248-11E8-B48F-1D18A9856A87 last_name: Maas orcid: 0000-0002-0845-1338 - first_name: Martin full_name: Rumpf, Martin last_name: Rumpf - first_name: Stefan full_name: Simon, Stefan last_name: Simon 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' 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. 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. 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. 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. short: J. Maas, M. Rumpf, S. Simon, in:, F. Lauze, Y. Dong, A. Bjorholm Dahl (Eds.), Springer, 2017, pp. 563–577. conference: end_date: 2017-06-08 location: Kolding, Denmark name: 'SSVM: Scale Space and Variational Methods in Computer Vision' start_date: 2017-06-04 date_created: 2018-12-11T11:49:34Z date_published: 2017-05-18T00:00:00Z date_updated: 2023-09-22T09:55:50Z day: '18' department: - _id: JaMa doi: 10.1007/978-3-319-58771-4_45 editor: - first_name: François full_name: Lauze, François last_name: Lauze - first_name: Yiqiu full_name: Dong, Yiqiu last_name: Dong - first_name: Anders full_name: Bjorholm Dahl, Anders last_name: Bjorholm Dahl external_id: isi: - '000432210900045' intvolume: ' 10302' isi: 1 language: - iso: eng month: '05' oa_version: None page: 563 - 577 publication_identifier: issn: - '03029743' publication_status: published publisher: Springer publist_id: '6410' quality_controlled: '1' scopus_import: '1' status: public title: Transport based image morphing with intensity modulation type: conference user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 10302 year: '2017' ... --- _id: '990' 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. article_processing_charge: No author: - first_name: Himani full_name: Sachdeva, Himani id: 42377A0A-F248-11E8-B48F-1D18A9856A87 last_name: Sachdeva - first_name: Nicholas H full_name: Barton, Nicholas H id: 4880FE40-F248-11E8-B48F-1D18A9856A87 last_name: Barton orcid: 0000-0002-8548-5240 citation: 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 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 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. 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. short: H. Sachdeva, N.H. Barton, Evolution; International Journal of Organic Evolution 71 (2017) 1478–1493. date_created: 2018-12-11T11:49:34Z date_published: 2017-06-01T00:00:00Z date_updated: 2025-05-28T11:42:51Z day: '01' ddc: - '576' department: - _id: NiBa doi: 10.1111/evo.13252 ec_funded: 1 external_id: isi: - '000403014800005' pmid: - '28419447' file: - access_level: open_access checksum: 6d4c38cb1347fd43620d1736c6df5c79 content_type: application/pdf creator: dernst date_created: 2019-04-17T07:37:04Z date_updated: 2020-07-14T12:48:18Z file_id: '6329' file_name: 2017_Evolution_Sachdeva_supplement.pdf file_size: 625260 relation: main_file - access_level: open_access checksum: f1d90dd8831b44baf49b4dd176f263af content_type: application/pdf creator: dernst date_created: 2019-04-17T07:37:04Z date_updated: 2020-07-14T12:48:18Z file_id: '6330' file_name: 2017_Evolution_Sachdeva_article.pdf file_size: 520110 relation: main_file file_date_updated: 2020-07-14T12:48:18Z has_accepted_license: '1' intvolume: ' 71' isi: 1 issue: '6' language: - iso: eng month: '06' oa: 1 oa_version: Submitted Version page: '1478 - 1493 ' pmid: 1 project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme - _id: 25B07788-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '250152' name: Limits to selection in biology and in evolutionary computation publication: Evolution; International Journal of Organic Evolution publication_identifier: issn: - '00143820' publication_status: published publisher: Wiley-Blackwell publist_id: '6409' pubrep_id: '977' quality_controlled: '1' scopus_import: '1' status: public title: Divergence and evolution of assortative mating in a polygenic trait model of speciation with gene flow type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 71 year: '2017' ... --- _id: '991' abstract: - lang: eng 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. article_processing_charge: No author: - first_name: Chong full_name: Chen, Chong id: 3DFD581A-F248-11E8-B48F-1D18A9856A87 last_name: Chen - first_name: Peter M full_name: Jonas, Peter M id: 353C1B58-F248-11E8-B48F-1D18A9856A87 last_name: Jonas orcid: 0000-0001-5001-4804 citation: 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' 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' 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.' ieee: 'C. Chen and P. M. Jonas, “Synaptotagmins: That’s why so many,” Neuron, vol. 94, no. 4. Elsevier, pp. 694–696, 2017.' ista: 'Chen C, Jonas PM. 2017. Synaptotagmins: That’s why so many. Neuron. 94(4), 694–696.' 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.' short: C. Chen, P.M. Jonas, Neuron 94 (2017) 694–696. date_created: 2018-12-11T11:49:34Z date_published: 2017-05-17T00:00:00Z date_updated: 2023-09-22T09:54:37Z day: '17' department: - _id: PeJo doi: 10.1016/j.neuron.2017.05.011 external_id: isi: - '000401415100002' intvolume: ' 94' isi: 1 issue: '4' language: - iso: eng month: '05' oa_version: None page: 694 - 696 publication: Neuron publication_identifier: issn: - '08966273' publication_status: published publisher: Elsevier publist_id: '6408' quality_controlled: '1' scopus_import: '1' status: public title: 'Synaptotagmins: That’s why so many' type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 94 year: '2017' ... --- _id: '992' 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)." acknowledgement: FP7/2007-2013/ERC grant agreement no 616160 alternative_title: - ISTA Thesis article_processing_charge: No author: - first_name: Michal full_name: Rolinek, Michal id: 3CB3BC06-F248-11E8-B48F-1D18A9856A87 last_name: Rolinek citation: ama: Rolinek M. Complexity of constraint satisfaction. 2017. doi:10.15479/AT:ISTA:th_815 apa: Rolinek, M. (2017). Complexity of constraint satisfaction. Institute of Science and Technology Austria. https://doi.org/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. 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. short: M. Rolinek, Complexity of Constraint Satisfaction, Institute of Science and Technology Austria, 2017. date_created: 2018-12-11T11:49:35Z date_published: 2017-05-01T00:00:00Z date_updated: 2023-09-07T12:05:41Z day: '01' ddc: - '004' degree_awarded: PhD department: - _id: VlKo doi: 10.15479/AT:ISTA:th_815 ec_funded: 1 file: - access_level: open_access checksum: 81761fb939acb7585c36629f765b4373 content_type: application/pdf creator: system date_created: 2018-12-12T10:07:55Z date_updated: 2020-07-14T12:48:18Z file_id: '4654' file_name: IST-2017-815-v1+3_final_blank_signature_maybe_pdfa.pdf file_size: 786145 relation: main_file - access_level: closed checksum: 2b2d7e1d6c1c79a9795a7aa0f860baf3 content_type: application/zip creator: dernst date_created: 2019-04-05T08:43:24Z date_updated: 2020-07-14T12:48:18Z file_id: '6208' file_name: 2017_Thesis_Rolinek_source.zip file_size: 5936337 relation: source_file file_date_updated: 2020-07-14T12:48:18Z has_accepted_license: '1' language: - iso: eng month: '05' oa: 1 oa_version: Published Version page: '97' project: - _id: 25FBA906-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '616160' name: 'Discrete Optimization in Computer Vision: Theory and Practice' publication_identifier: issn: - 2663-337X publication_status: published publisher: Institute of Science and Technology Austria publist_id: '6407' pubrep_id: '815' status: public supervisor: - first_name: Vladimir full_name: Kolmogorov, Vladimir id: 3D50B0BA-F248-11E8-B48F-1D18A9856A87 last_name: Kolmogorov title: Complexity of constraint satisfaction type: dissertation user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 year: '2017' ... --- _id: '993' abstract: - lang: eng 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. article_number: '15140' article_processing_charge: Yes (in subscription journal) author: - first_name: Anna full_name: Levina (Martius), Anna id: 35AF8020-F248-11E8-B48F-1D18A9856A87 last_name: Levina (Martius) - first_name: Viola full_name: Priesemann, Viola last_name: Priesemann citation: ama: Levina (Martius) A, Priesemann V. Subsampling scaling. Nature Communications. 2017;8. doi:10.1038/ncomms15140 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. ieee: A. Levina (Martius) and V. Priesemann, “Subsampling scaling,” Nature Communications, vol. 8. Nature Publishing Group, 2017. ista: Levina (Martius) A, Priesemann V. 2017. Subsampling scaling. Nature Communications. 8, 15140. mla: Levina (Martius), Anna, and Viola Priesemann. “Subsampling Scaling.” Nature Communications, vol. 8, 15140, Nature Publishing Group, 2017, doi:10.1038/ncomms15140. short: A. Levina (Martius), V. Priesemann, Nature Communications 8 (2017). date_created: 2018-12-11T11:49:35Z date_published: 2017-05-04T00:00:00Z date_updated: 2023-09-22T09:54:07Z day: '04' ddc: - '005' - '571' department: - _id: GaTk - _id: JoCs doi: 10.1038/ncomms15140 ec_funded: 1 external_id: isi: - '000400560700001' file: - access_level: open_access checksum: 9880212f8c4c53404c7c6fbf9023c53a content_type: application/pdf creator: system date_created: 2018-12-12T10:15:05Z date_updated: 2020-07-14T12:48:19Z file_id: '5122' file_name: IST-2017-819-v1+1_2017_Levina_SubsamplingScaling.pdf file_size: 746224 relation: main_file file_date_updated: 2020-07-14T12:48:19Z has_accepted_license: '1' intvolume: ' 8' isi: 1 language: - iso: eng month: '05' oa: 1 oa_version: Published Version project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme publication: Nature Communications publication_identifier: issn: - '20411723' publication_status: published publisher: Nature Publishing Group publist_id: '6406' pubrep_id: '819' quality_controlled: '1' scopus_import: '1' status: public title: Subsampling scaling tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 8 year: '2017' ... --- _id: '994' abstract: - lang: eng 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. article_processing_charge: No author: - first_name: Igor full_name: Cherepanov, Igor id: 339C7E5A-F248-11E8-B48F-1D18A9856A87 last_name: Cherepanov - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: 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 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 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. 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. ista: Cherepanov I, Lemeshko M. 2017. Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules. Physical Review Materials. 1(3). 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. short: I. Cherepanov, M. Lemeshko, Physical Review Materials 1 (2017). date_created: 2018-12-11T11:49:35Z date_published: 2017-08-08T00:00:00Z date_updated: 2023-09-22T09:53:42Z day: '08' department: - _id: MiLe doi: 10.1103/PhysRevMaterials.1.035602 ec_funded: 1 external_id: isi: - '000416564000004' intvolume: ' 1' isi: 1 issue: '3' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1705.09220 month: '08' oa: 1 oa_version: Submitted Version project: - _id: 26031614-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P29902 name: Quantum rotations in the presence of a many-body environment - _id: 2564DBCA-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '665385' name: International IST Doctoral Program publication: Physical Review Materials publication_status: published publisher: American Physical Society publist_id: '6405' quality_controlled: '1' scopus_import: '1' status: public title: Fingerprints of angulon instabilities in the spectra of matrix-isolated molecules type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 1 year: '2017' ... --- _id: '995' abstract: - lang: eng 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. article_number: '085410' article_processing_charge: No author: - first_name: Giacomo full_name: Bighin, Giacomo id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87 last_name: Bighin orcid: 0000-0001-8823-9777 - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: 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 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 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. 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. 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. short: G. Bighin, M. Lemeshko, Physical Review B - Condensed Matter and Materials Physics 96 (2017). date_created: 2018-12-11T11:49:36Z date_published: 2017-08-07T00:00:00Z date_updated: 2023-09-22T09:53:17Z day: '07' department: - _id: MiLe doi: 10.1103/PhysRevB.96.085410 external_id: isi: - '000407017100009' intvolume: ' 96' isi: 1 issue: '8' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1704.02616 month: '08' oa: 1 oa_version: Submitted Version project: - _id: 26031614-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P29902 name: Quantum rotations in the presence of a many-body environment publication: Physical Review B - Condensed Matter and Materials Physics publication_identifier: issn: - '24699950' publication_status: published publisher: American Physical Society publist_id: '6404' quality_controlled: '1' scopus_import: '1' status: public title: Diagrammatic approach to orbital quantum impurities interacting with a many-particle environment type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 96 year: '2017' ... --- _id: '996' abstract: - lang: eng 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. ' article_number: '013946' article_processing_charge: No author: - first_name: Benjamin full_name: Shepperson, Benjamin last_name: Shepperson - first_name: Adam full_name: Chatterley, Adam last_name: Chatterley - first_name: Anders full_name: Søndergaard, Anders last_name: Søndergaard - first_name: Lars full_name: Christiansen, Lars last_name: Christiansen - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 - first_name: Henrik full_name: Stapelfeldt, Henrik last_name: Stapelfeldt citation: 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 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 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. 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. 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. 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. short: B. Shepperson, A. Chatterley, A. Søndergaard, L. Christiansen, M. Lemeshko, H. Stapelfeldt, The Journal of Chemical Physics 147 (2017). date_created: 2018-12-11T11:49:36Z date_published: 2017-06-01T00:00:00Z date_updated: 2024-02-28T13:02:26Z day: '01' department: - _id: MiLe doi: 10.1063/1.4983703 external_id: isi: - '000405089400047' intvolume: ' 147' isi: 1 issue: '1' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1704.03684 month: '06' oa: 1 oa_version: Submitted Version publication: The Journal of Chemical Physics publication_identifier: issn: - '00219606' publication_status: published publisher: AIP Publishing publist_id: '6403' quality_controlled: '1' scopus_import: '1' status: public title: Strongly aligned molecules inside helium droplets in the near-adiabatic regime type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 147 year: '2017' ... --- _id: '997' abstract: - lang: eng 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. article_number: '235301' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Enderalp full_name: Yakaboylu, Enderalp id: 38CB71F6-F248-11E8-B48F-1D18A9856A87 last_name: Yakaboylu orcid: 0000-0001-5973-0874 - first_name: Andreas full_name: Deuchert, Andreas id: 4DA65CD0-F248-11E8-B48F-1D18A9856A87 last_name: Deuchert orcid: 0000-0003-3146-6746 - first_name: Mikhail full_name: Lemeshko, Mikhail id: 37CB05FA-F248-11E8-B48F-1D18A9856A87 last_name: Lemeshko orcid: 0000-0002-6990-7802 citation: 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 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 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. 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. 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. short: E. Yakaboylu, A. Deuchert, M. Lemeshko, Physical Review Letters 119 (2017). date_created: 2018-12-11T11:49:36Z date_published: 2017-12-06T00:00:00Z date_updated: 2023-10-10T13:31:54Z day: '06' department: - _id: MiLe - _id: RoSe doi: 10.1103/PhysRevLett.119.235301 ec_funded: 1 external_id: arxiv: - '1705.05162' isi: - '000417132100007' intvolume: ' 119' isi: 1 issue: '23' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1705.05162 month: '12' oa: 1 oa_version: Preprint project: - _id: 25681D80-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '291734' name: International IST Postdoc Fellowship Programme - _id: 25C6DC12-B435-11E9-9278-68D0E5697425 call_identifier: H2020 grant_number: '694227' name: Analysis of quantum many-body systems - _id: 26031614-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: P29902 name: Quantum rotations in the presence of a many-body environment publication: Physical Review Letters publication_identifier: issn: - 0031-9007 publication_status: published publisher: American Physical Society publist_id: '6401' quality_controlled: '1' scopus_import: '1' status: public title: Emergence of non-abelian magnetic monopoles in a quantum impurity problem type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 119 year: '2017' ... --- _id: '998' abstract: - lang: eng 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. ' article_processing_charge: No author: - first_name: Sylvestre Alvise full_name: Rebuffi, Sylvestre Alvise last_name: Rebuffi - first_name: Alexander full_name: Kolesnikov, Alexander id: 2D157DB6-F248-11E8-B48F-1D18A9856A87 last_name: Kolesnikov - first_name: Georg full_name: Sperl, Georg id: 4DD40360-F248-11E8-B48F-1D18A9856A87 last_name: Sperl - first_name: Christoph full_name: Lampert, Christoph id: 40C20FD2-F248-11E8-B48F-1D18A9856A87 last_name: Lampert orcid: 0000-0001-8622-7887 citation: 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' 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' 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.' 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.' 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.' 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.' short: S.A. Rebuffi, A. Kolesnikov, G. Sperl, C. Lampert, in:, IEEE, 2017, pp. 5533–5542. conference: end_date: 2017-07-26 location: Honolulu, HA, United States name: 'CVPR: Computer Vision and Pattern Recognition' start_date: 2017-07-21 date_created: 2018-12-11T11:49:37Z date_published: 2017-04-14T00:00:00Z date_updated: 2023-09-22T09:51:58Z day: '14' department: - _id: ChLa - _id: ChWo doi: 10.1109/CVPR.2017.587 ec_funded: 1 external_id: isi: - '000418371405066' intvolume: ' 2017' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1611.07725 month: '04' oa: 1 oa_version: Submitted Version page: 5533 - 5542 project: - _id: 2532554C-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '308036' name: Lifelong Learning of Visual Scene Understanding publication_identifier: isbn: - 978-153860457-1 publication_status: published publisher: IEEE publist_id: '6400' quality_controlled: '1' scopus_import: '1' status: public title: 'iCaRL: Incremental classifier and representation learning' type: conference user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 2017 year: '2017' ... --- _id: '999' abstract: - lang: eng 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. ' alternative_title: - PMLR article_processing_charge: No author: - first_name: Anastasia full_name: Pentina, Anastasia id: 42E87FC6-F248-11E8-B48F-1D18A9856A87 last_name: Pentina - first_name: Christoph full_name: Lampert, Christoph id: 40C20FD2-F248-11E8-B48F-1D18A9856A87 last_name: Lampert orcid: 0000-0001-8622-7887 citation: ama: 'Pentina A, Lampert C. Multi-task learning with labeled and unlabeled tasks. In: Vol 70. ML Research Press; 2017:2807-2816.' 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.' chicago: Pentina, Anastasia, and Christoph Lampert. “Multi-Task Learning with Labeled and Unlabeled Tasks,” 70:2807–16. ML Research Press, 2017. 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.' 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.' mla: Pentina, Anastasia, and Christoph Lampert. Multi-Task Learning with Labeled and Unlabeled Tasks. Vol. 70, ML Research Press, 2017, pp. 2807–16. short: A. Pentina, C. Lampert, in:, ML Research Press, 2017, pp. 2807–2816. conference: end_date: 2017-08-11 location: Sydney, Australia name: 'ICML: International Conference on Machine Learning' start_date: 2017-08-06 date_created: 2018-12-11T11:49:37Z date_published: 2017-06-08T00:00:00Z date_updated: 2023-10-17T11:53:32Z day: '08' department: - _id: ChLa ec_funded: 1 external_id: isi: - '000683309502093' intvolume: ' 70' isi: 1 language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1602.06518 month: '06' oa: 1 oa_version: Submitted Version page: 2807 - 2816 project: - _id: 2532554C-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '308036' name: Lifelong Learning of Visual Scene Understanding publication_identifier: isbn: - '9781510855144' publication_status: published publisher: ML Research Press publist_id: '6399' quality_controlled: '1' scopus_import: '1' status: public title: Multi-task learning with labeled and unlabeled tasks type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 70 year: '2017' ... --- _id: '373' 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. ' 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. article_processing_charge: No article_type: review author: - first_name: Claudia full_name: Coughlan, Claudia last_name: Coughlan - first_name: Maria full_name: Ibanez Sabate, Maria id: 43C61214-F248-11E8-B48F-1D18A9856A87 last_name: Ibanez Sabate orcid: 0000-0001-5013-2843 - first_name: Oleksandr full_name: Dobrozhan, Oleksandr last_name: Dobrozhan - first_name: Ajay full_name: Singh, Ajay last_name: Singh - first_name: Andreu full_name: Cabot, Andreu last_name: Cabot - first_name: Kevin full_name: Ryan, Kevin last_name: Ryan citation: 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 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 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. 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. ista: Coughlan C, Ibáñez M, Dobrozhan O, Singh A, Cabot A, Ryan K. 2017. Compound copper chalcogenide nanocrystals. Chemical Reviews. 117(9), 5865–6109. 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. short: C. Coughlan, M. Ibáñez, O. Dobrozhan, A. Singh, A. Cabot, K. Ryan, Chemical Reviews 117 (2017) 5865–6109. date_created: 2018-12-11T11:46:06Z date_published: 2017-04-10T00:00:00Z date_updated: 2024-03-05T12:17:59Z day: '10' doi: 10.1021/acs.chemrev.6b00376 extern: '1' external_id: pmid: - '28394585' intvolume: ' 117' issue: '9' language: - iso: eng month: '04' oa_version: None page: 5865 - 6109 pmid: 1 publication: Chemical Reviews publication_identifier: eissn: - 1520-6890 issn: - 0009-2665 publication_status: published publisher: American Chemical Society publist_id: '7456' quality_controlled: '1' status: public title: Compound copper chalcogenide nanocrystals type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 117 year: '2017' ... --- _id: '374' abstract: - lang: eng 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. 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). article_processing_charge: No article_type: original author: - first_name: Silvia full_name: Ortega, Silvia last_name: Ortega - first_name: Maria full_name: Ibanez Sabate, Maria id: 43C61214-F248-11E8-B48F-1D18A9856A87 last_name: Ibanez Sabate orcid: 0000-0001-5013-2843 - first_name: Yu full_name: Liu, Yu id: 2A70014E-F248-11E8-B48F-1D18A9856A87 last_name: Liu orcid: 0000-0001-7313-6740 - first_name: Yu full_name: Zhang, Yu last_name: Zhang - first_name: Maksym full_name: Kovalenko, Maksym last_name: Kovalenko - first_name: Doris full_name: Cadavid, Doris last_name: Cadavid - first_name: Andreu full_name: Cabot, Andreu last_name: Cabot citation: 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 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 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. 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. 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. 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. short: S. Ortega, M. Ibáñez, Y. Liu, Y. Zhang, M. Kovalenko, D. Cadavid, A. Cabot, Chemical Society Reviews 46 (2017) 3510–3528. date_created: 2018-12-11T11:46:06Z date_published: 2017-06-21T00:00:00Z date_updated: 2024-03-05T12:21:43Z day: '21' doi: 10.1039/c6cs00567e extern: '1' external_id: pmid: - '28470243' intvolume: ' 46' issue: '12' language: - iso: eng month: '06' oa_version: None page: 3510 - 3528 pmid: 1 publication: Chemical Society Reviews publication_identifier: eissn: - 1460-4744 issn: - 0306-0012 publication_status: published publisher: Royal Society of Chemistry publist_id: '7454' quality_controlled: '1' status: public title: Bottom up engineering of thermoelectric nanomaterials and devices from solution processed nanoparticle building blocks type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 46 year: '2017' ... --- _id: '375' abstract: - lang: eng 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" 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. article_processing_charge: No article_type: original author: - first_name: Taisiia full_name: Berestok, Taisiia last_name: Berestok - first_name: Pablo full_name: Guardia, Pablo last_name: Guardia - first_name: Javier full_name: Blanco, Javier last_name: Blanco - first_name: Raquel full_name: Nafria, Raquel last_name: Nafria - first_name: Pau full_name: Torruella, Pau last_name: Torruella - first_name: Luis full_name: López Conesa, Luis last_name: López Conesa - first_name: Sònia full_name: Estradé, Sònia last_name: Estradé - first_name: Maria full_name: Ibanez Sabate, Maria id: 43C61214-F248-11E8-B48F-1D18A9856A87 last_name: Ibanez Sabate orcid: 0000-0001-5013-2843 - first_name: Jonathan full_name: De Roo, Jonathan last_name: De Roo - first_name: Zhishan full_name: Luo, Zhishan last_name: Luo - first_name: Doris full_name: Cadavid, Doris last_name: Cadavid - first_name: José full_name: Martins, José last_name: Martins - first_name: Maksym full_name: Kovalenko, Maksym last_name: Kovalenko - first_name: Francesca full_name: Peiró, Francesca last_name: Peiró - first_name: Andreu full_name: Cabot, Andreu last_name: Cabot citation: 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 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 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. ieee: T. Berestok et al., “Tuning branching in ceria nanocrystals,” Chemistry of Materials, vol. 29, no. 10. American Chemical Society, pp. 4418–4424, 2017. 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. 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. 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. date_created: 2018-12-11T11:46:07Z date_published: 2017-04-24T00:00:00Z date_updated: 2024-03-05T12:19:17Z day: '24' doi: 10.1021/acs.chemmater.7b00896 extern: '1' intvolume: ' 29' issue: '10' language: - iso: eng month: '04' oa_version: None page: 4418 - 4424 publication: Chemistry of Materials publication_identifier: eissn: - 1520-5002 issn: - 0897-4756 publication_status: published publisher: American Chemical Society publist_id: '7455' quality_controlled: '1' status: public title: Tuning branching in ceria nanocrystals type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 29 year: '2017' ... --- _id: '391' 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. ' author: - first_name: Yishuai full_name: Xu, Yishuai last_name: Xu - first_name: Janet full_name: Chiu, Janet last_name: Chiu - first_name: Lin full_name: Miao, Lin last_name: Miao - first_name: Haowei full_name: He, Haowei last_name: He - first_name: Zhanybek full_name: Alpichshev, Zhanybek id: 45E67A2A-F248-11E8-B48F-1D18A9856A87 last_name: Alpichshev orcid: 0000-0002-7183-5203 - first_name: Aharon full_name: Kapitulnik, Aharon last_name: Kapitulnik - first_name: Rudro full_name: Biswas, Rudro last_name: Biswas - first_name: Lewis full_name: Wray, Lewis last_name: Wray citation: 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 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 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. ieee: Y. Xu et al., “Disorder enabled band structure engineering of a topological insulator surface,” Nature Communications, vol. 8. Nature Publishing Group, 2017. 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. 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. short: Y. Xu, J. Chiu, L. Miao, H. He, Z. Alpichshev, A. Kapitulnik, R. Biswas, L. Wray, Nature Communications 8 (2017). date_created: 2018-12-11T11:46:12Z date_published: 2017-02-03T00:00:00Z date_updated: 2021-01-12T07:53:08Z day: '03' doi: 10.1038/ncomms14081 extern: '1' intvolume: ' 8' language: - iso: eng month: '02' oa_version: None publication: Nature Communications publication_status: published publisher: Nature Publishing Group publist_id: '7438' status: public title: Disorder enabled band structure engineering of a topological insulator surface type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 8 year: '2017' ... --- _id: '392' abstract: - lang: eng 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. 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: - first_name: Inna full_name: Vishik, Inna last_name: Vishik - first_name: Fahad full_name: Mahmood, Fahad last_name: Mahmood - first_name: Zhanybek full_name: Alpichshev, Zhanybek id: 45E67A2A-F248-11E8-B48F-1D18A9856A87 last_name: Alpichshev orcid: 0000-0002-7183-5203 - first_name: Nuh full_name: Gedik, Nuh last_name: Gedik - first_name: Joshu full_name: Higgins, Joshu last_name: Higgins - first_name: Richard full_name: Greene, Richard last_name: Greene citation: 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 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 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. 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). 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. short: I. Vishik, F. Mahmood, Z. Alpichshev, N. Gedik, J. Higgins, R. Greene, Physical Review B 95 (2017). date_created: 2018-12-11T11:46:13Z date_published: 2017-03-13T00:00:00Z date_updated: 2021-01-12T07:53:12Z day: '13' doi: 10.1103/PhysRevB.95.115125 extern: '1' intvolume: ' 95' issue: '11' language: - iso: eng main_file_link: - open_access: '1' url: http://dspace.mit.edu/handle/1721.1/109835 month: '03' oa: 1 oa_version: None publication: Physical Review B publication_status: published publisher: American Physical Society publist_id: '7437' status: public title: Ultrafast dynamics in the presence of antiferromagnetic correlations in electron doped cuprate La2 xCexCuO4±δ type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 95 year: '2017' ... --- _id: '393' abstract: - lang: eng 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. ' 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" author: - first_name: Zhanybek full_name: Alpichshev, Zhanybek id: 45E67A2A-F248-11E8-B48F-1D18A9856A87 last_name: Alpichshev orcid: 0000-0002-7183-5203 - first_name: Edbert full_name: Sie, Edbert last_name: Sie - first_name: Fahad full_name: Mahmood, Fahad last_name: Mahmood - first_name: Gang full_name: Cao, Gang last_name: Cao - first_name: Nuh full_name: Gedik, Nuh last_name: Gedik citation: 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 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 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. 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. short: Z. Alpichshev, E. Sie, F. Mahmood, G. Cao, N. Gedik, Physical Review B 96 (2017). date_created: 2018-12-11T11:46:13Z date_published: 2017-12-26T00:00:00Z date_updated: 2021-01-12T07:53:16Z day: '26' doi: 10.1103/PhysRevB.96.235141 extern: '1' intvolume: ' 96' issue: '23' language: - iso: eng main_file_link: - open_access: '1' url: http://dspace.mit.edu/handle/1721.1/114259 month: '12' oa: 1 oa_version: None publication: Physical Review B publication_status: published publisher: American Physical Society publist_id: '7436' status: public title: Origin of the exciton mass in the frustrated Mott insulator Na2IrO3 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 96 year: '2017' ... --- _id: '424' abstract: - lang: eng 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).' author: - first_name: Xavier full_name: Goaoc, Xavier last_name: Goaoc - first_name: Pavel full_name: Paták, Pavel last_name: Paták - first_name: Zuzana full_name: Patakova, Zuzana last_name: Patakova orcid: 0000-0002-3975-1683 - first_name: Martin full_name: Tancer, Martin last_name: Tancer orcid: 0000-0002-1191-6714 - first_name: Uli full_name: Wagner, Uli id: 36690CA2-F248-11E8-B48F-1D18A9856A87 last_name: Wagner orcid: 0000-0002-1494-0568 citation: 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' 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.' 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.' 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.' 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.' 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.' date_created: 2018-12-11T11:46:24Z date_published: 2017-10-06T00:00:00Z date_updated: 2024-02-28T12:59:37Z day: '06' department: - _id: UlWa doi: 10.1007/978-3-319-44479-6_17 editor: - first_name: Martin full_name: Loebl, Martin last_name: Loebl - first_name: Jaroslav full_name: Nešetřil, Jaroslav last_name: Nešetřil - first_name: Robin full_name: Thomas, Robin last_name: Thomas language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1310.4613v3 month: '10' oa: 1 oa_version: Published Version page: 407 - 447 publication: 'A Journey through Discrete Mathematics: A Tribute to Jiri Matousek' publication_identifier: isbn: - 978-331944479-6 publication_status: published publisher: Springer publist_id: '7399' quality_controlled: '1' related_material: record: - id: '1512' relation: earlier_version status: public scopus_import: 1 series_title: A Journey Through Discrete Mathematics status: public title: Bounding helly numbers via betti numbers type: book_chapter user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87 year: '2017' ... --- _id: '431' 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. ' alternative_title: - Advances in Neural Information Processing Systems article_processing_charge: No arxiv: 1 author: - first_name: Dan-Adrian full_name: Alistarh, Dan-Adrian id: 4A899BFC-F248-11E8-B48F-1D18A9856A87 last_name: Alistarh orcid: 0000-0003-3650-940X - first_name: Demjan full_name: Grubic, Demjan last_name: Grubic - first_name: Jerry full_name: Li, Jerry last_name: Li - first_name: Ryota full_name: Tomioka, Ryota last_name: Tomioka - first_name: Milan full_name: Vojnović, Milan last_name: Vojnović citation: 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.' 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.' 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.' 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.' 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.' short: D.-A. Alistarh, D. Grubic, J. Li, R. Tomioka, M. Vojnović, in:, Neural Information Processing Systems Foundation, 2017, pp. 1710–1721. conference: end_date: 2017-12-09 location: Long Beach, CA, United States name: 'NIPS: Neural Information Processing System' start_date: 2017-12-04 date_created: 2018-12-11T11:46:26Z date_published: 2017-01-01T00:00:00Z date_updated: 2023-10-17T11:48:03Z day: '01' department: - _id: DaAl external_id: arxiv: - '1610.02132' intvolume: ' 2017' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/1610.02132 month: '01' oa: 1 oa_version: Submitted Version page: 1710-1721 publication_identifier: issn: - '10495258' publication_status: published publisher: Neural Information Processing Systems Foundation publist_id: '7392' quality_controlled: '1' status: public title: 'QSGD: Communication-efficient SGD via gradient quantization and encoding' type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 2017 year: '2017' ...