[{"volume":20,"acknowledgement":"This research was supported by the Scientific Service Units of Institute of Science and Technology (IST) Austria through resources provided by the Miba Machine Shop and the nanofabrication facility, and was made possible with the support of the NOMIS Foundation. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant agreements no. 844511 and no. 75441, and by the Austrian Science Fund FWF-P 30207 project. A.B. acknowledges support from the European Union Horizon 2020 FET project microSPIRE, no. 766955. M. Botifoll and J.A. acknowledge funding from Generalitat de Catalunya 2017 SGR 327. The Catalan Institute of Nanoscience and Nanotechnology (ICN2) is supported by the Severo Ochoa programme from the Spanish Ministery of Economy (MINECO) (grant no. SEV-2017-0706) and is funded by the Catalonian Research Centre (CERCA) Programme, Generalitat de Catalunya. Part of the present work has been performed within the framework of the Universitat Autónoma de Barcelona Materials Science PhD programme. Part of the HAADF scanning transmission electron microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon, Universidad de Zaragoza. ICN2 acknowledge support from the Spanish Superior Council of Scientific Research (CSIC) Research Platform on Quantum Technologies PTI-001. M.B. acknowledges funding from the Catalan Agency for Management of University and Research Grants (AGAUR) Generalitat de Catalunya formation of investigators (FI) PhD grant.","arxiv":1,"doi":"10.1038/s41563-021-01022-2","day":"01","abstract":[{"text":"Spin qubits are considered to be among the most promising candidates for building a quantum processor. Group IV hole spin qubits have moved into the focus of interest due to the ease of operation and compatibility with Si technology. In addition, Ge offers the option for monolithic superconductor-semiconductor integration. Here we demonstrate a hole spin qubit operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge and by encoding the qubit into the singlet-triplet states of a double quantum dot. We observe electrically controlled X and Z-rotations with tunable frequencies exceeding 100 MHz and dephasing times of 1μs which we extend beyond 15μs with echo techniques. These results show that Ge hole singlet triplet qubits outperform their electronic Si and GaAs based counterparts in speed and coherence, respectively. In addition, they are on par with Ge single spin qubits, but can be operated at much lower fields underlining their potential for on chip integration with superconducting technologies.","lang":"eng"}],"date_updated":"2024-03-25T23:30:14Z","year":"2021","citation":{"ista":"Jirovec D, Hofmann AC, Ballabio A, Mutter PM, Tavani G, Botifoll M, Crippa A, Kukucka J, Sagi O, Martins F, Saez Mollejo J, Prieto Gonzalez I, Borovkov M, Arbiol J, Chrastina D, Isella G, Katsaros G. 2021. A singlet triplet hole spin qubit in planar Ge. Nature Materials. 20(8), 1106–1112.","mla":"Jirovec, Daniel, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” <i>Nature Materials</i>, vol. 20, no. 8, Springer Nature, 2021, pp. 1106–1112, doi:<a href=\"https://doi.org/10.1038/s41563-021-01022-2\">10.1038/s41563-021-01022-2</a>.","short":"D. Jirovec, A.C. Hofmann, A. Ballabio, P.M. Mutter, G. Tavani, M. Botifoll, A. Crippa, J. Kukucka, O. Sagi, F. Martins, J. Saez Mollejo, I. Prieto Gonzalez, M. Borovkov, J. Arbiol, D. Chrastina, G. Isella, G. Katsaros, Nature Materials 20 (2021) 1106–1112.","ieee":"D. Jirovec <i>et al.</i>, “A singlet triplet hole spin qubit in planar Ge,” <i>Nature Materials</i>, vol. 20, no. 8. Springer Nature, pp. 1106–1112, 2021.","chicago":"Jirovec, Daniel, Andrea C Hofmann, Andrea Ballabio, Philipp M. Mutter, Giulio Tavani, Marc Botifoll, Alessandro Crippa, et al. “A Singlet Triplet Hole Spin Qubit in Planar Ge.” <i>Nature Materials</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1038/s41563-021-01022-2\">https://doi.org/10.1038/s41563-021-01022-2</a>.","ama":"Jirovec D, Hofmann AC, Ballabio A, et al. A singlet triplet hole spin qubit in planar Ge. <i>Nature Materials</i>. 2021;20(8):1106–1112. doi:<a href=\"https://doi.org/10.1038/s41563-021-01022-2\">10.1038/s41563-021-01022-2</a>","apa":"Jirovec, D., Hofmann, A. C., Ballabio, A., Mutter, P. M., Tavani, G., Botifoll, M., … Katsaros, G. (2021). A singlet triplet hole spin qubit in planar Ge. <i>Nature Materials</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41563-021-01022-2\">https://doi.org/10.1038/s41563-021-01022-2</a>"},"isi":1,"external_id":{"isi":["000657596400001"],"arxiv":["2011.13755"]},"publisher":"Springer Nature","article_type":"original","page":"1106–1112","ec_funded":1,"quality_controlled":"1","publication_status":"published","article_processing_charge":"No","department":[{"_id":"GeKa"},{"_id":"NanoFab"},{"_id":"GradSch"}],"date_created":"2020-12-02T10:50:47Z","title":"A singlet triplet hole spin qubit in planar Ge","intvolume":"        20","_id":"8909","scopus_import":"1","author":[{"id":"4C473F58-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-7197-4801","full_name":"Jirovec, Daniel","first_name":"Daniel","last_name":"Jirovec"},{"full_name":"Hofmann, Andrea C","first_name":"Andrea C","last_name":"Hofmann","id":"340F461A-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Ballabio, Andrea","first_name":"Andrea","last_name":"Ballabio"},{"first_name":"Philipp M.","last_name":"Mutter","full_name":"Mutter, Philipp M."},{"full_name":"Tavani, Giulio","last_name":"Tavani","first_name":"Giulio"},{"full_name":"Botifoll, Marc","last_name":"Botifoll","first_name":"Marc"},{"orcid":"0000-0002-2968-611X","full_name":"Crippa, Alessandro","first_name":"Alessandro","last_name":"Crippa","id":"1F2B21A2-F6E7-11E9-9B82-F7DBE5697425"},{"full_name":"Kukucka, Josip","last_name":"Kukucka","first_name":"Josip","id":"3F5D8856-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Oliver","last_name":"Sagi","full_name":"Sagi, Oliver","id":"71616374-A8E9-11E9-A7CA-09ECE5697425"},{"id":"38F80F9A-1CB8-11EA-BC76-B49B3DDC885E","orcid":"0000-0003-2668-2401","full_name":"Martins, Frederico","first_name":"Frederico","last_name":"Martins"},{"full_name":"Saez Mollejo, Jaime","first_name":"Jaime","last_name":"Saez Mollejo","id":"e0390f72-f6e0-11ea-865d-862393336714"},{"full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357","last_name":"Prieto Gonzalez","first_name":"Ivan","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"id":"2ac7a0a2-3562-11eb-9256-fbd18ea55087","first_name":"Maksim","last_name":"Borovkov","full_name":"Borovkov, Maksim"},{"first_name":"Jordi","last_name":"Arbiol","full_name":"Arbiol, Jordi"},{"last_name":"Chrastina","first_name":"Daniel","full_name":"Chrastina, Daniel"},{"full_name":"Isella, Giovanni","first_name":"Giovanni","last_name":"Isella"},{"orcid":"0000-0001-8342-202X","full_name":"Katsaros, Georgios","first_name":"Georgios","last_name":"Katsaros","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"issue":"8","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2011.13755"}],"status":"public","related_material":{"record":[{"status":"public","id":"9323","relation":"research_data"},{"relation":"dissertation_contains","id":"10058","status":"public"}],"link":[{"url":"https://ist.ac.at/en/news/quantum-computing-with-holes/","description":"News on IST Homepage","relation":"press_release"}]},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publication_identifier":{"eissn":["1476-4660"],"issn":["1476-1122"]},"oa":1,"date_published":"2021-08-01T00:00:00Z","type":"journal_article","language":[{"iso":"eng"}],"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"oa_version":"Preprint","project":[{"name":"Majorana bound states in Ge/SiGe heterostructures","grant_number":"844511","call_identifier":"H2020","_id":"26A151DA-B435-11E9-9278-68D0E5697425"},{"_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411"},{"name":"Hole spin orbit qubits in Ge quantum wells","grant_number":"P30207","call_identifier":"FWF","_id":"2641CE5E-B435-11E9-9278-68D0E5697425"},{"_id":"262116AA-B435-11E9-9278-68D0E5697425","name":"Hybrid Semiconductor - Superconductor Quantum Devices"}],"month":"08","publication":"Nature Materials"},{"volume":11,"acknowledgement":"P.A.-M. acknowledges financial support through JAE Intro program from the Superior\r\nCouncil of Scientific Investigations and the Spanish Ministry of Science and Innovation (grant number JAEINT_20_00589). G.Á.-P. and J.T.-G. acknowledge financial support through the Severo Ochoa Program from the Government of the Principality of Asturias (grant numbers PA-20-PF-BP19-053 and PA-18-PF-BP17-126, respectively). J.M.-S. acknowledges financial support from the Ramón y Cajal Program of the Government of Spain (RYC2018-026196-I) and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-110308GA-I00). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-111156GB-I00).","ddc":["620"],"doi":"10.3390/nano11010120","day":"07","abstract":[{"lang":"eng","text":"Layered materials in which individual atomic layers are bonded by weak van der Waals forces (vdW materials) constitute one of the most prominent platforms for materials research. Particularly, polar vdW crystals, such as hexagonal boron nitride (h-BN), alpha-molybdenum trioxide (α-MoO3) or alpha-vanadium pentoxide (α-V2O5), have received significant attention in nano-optics, since they support phonon polaritons (PhPs)―light coupled to lattice vibrations― with strong electromagnetic confinement and low optical losses. Recently, correlative far- and near-field studies of α-MoO3 have been demonstrated as an effective strategy to accurately extract the permittivity of this material. Here, we use this accurately characterized and low-loss polaritonic material to sense its local dielectric environment, namely silica (SiO2), one of the most widespread substrates in nanotechnology. By studying the propagation of PhPs on α-MoO3 flakes with different thicknesses laying on SiO2 substrates via near-field microscopy (s-SNOM), we extract locally the infrared permittivity of SiO2. Our work reveals PhPs nanoimaging as a versatile method for the quantitative characterization of the local optical properties of dielectric substrates, crucial for understanding and predicting the response of nanomaterials and for the future scalability of integrated nanophotonic devices. "}],"date_updated":"2023-08-07T13:35:50Z","year":"2021","citation":{"short":"P. Aguilar-Merino, G. Álvarez-Pérez, J. Taboada-Gutiérrez, J. Duan, I. Prieto Gonzalez, L.M. Álvarez-Prado, A.Y. Nikitin, J. Martín-Sánchez, P. Alonso-González, Nanomaterials 11 (2021).","mla":"Aguilar-Merino, Patricia, et al. “Extracting the Infrared Permittivity of SiO2 Substrates Locally by Near-Field Imaging of Phonon Polaritons in a van Der Waals Crystal.” <i>Nanomaterials</i>, vol. 11, no. 1, 120, MDPI, 2021, doi:<a href=\"https://doi.org/10.3390/nano11010120\">10.3390/nano11010120</a>.","ista":"Aguilar-Merino P, Álvarez-Pérez G, Taboada-Gutiérrez J, Duan J, Prieto Gonzalez I, Álvarez-Prado LM, Nikitin AY, Martín-Sánchez J, Alonso-González P. 2021. Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. Nanomaterials. 11(1), 120.","ama":"Aguilar-Merino P, Álvarez-Pérez G, Taboada-Gutiérrez J, et al. Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. <i>Nanomaterials</i>. 2021;11(1). doi:<a href=\"https://doi.org/10.3390/nano11010120\">10.3390/nano11010120</a>","apa":"Aguilar-Merino, P., Álvarez-Pérez, G., Taboada-Gutiérrez, J., Duan, J., Prieto Gonzalez, I., Álvarez-Prado, L. M., … Alonso-González, P. (2021). Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. <i>Nanomaterials</i>. MDPI. <a href=\"https://doi.org/10.3390/nano11010120\">https://doi.org/10.3390/nano11010120</a>","ieee":"P. Aguilar-Merino <i>et al.</i>, “Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal,” <i>Nanomaterials</i>, vol. 11, no. 1. MDPI, 2021.","chicago":"Aguilar-Merino, Patricia, Gonzalo Álvarez-Pérez, Javier Taboada-Gutiérrez, Jiahua Duan, Ivan Prieto Gonzalez, Luis Manuel Álvarez-Prado, Alexey Y. Nikitin, Javier Martín-Sánchez, and Pablo Alonso-González. “Extracting the Infrared Permittivity of SiO2 Substrates Locally by Near-Field Imaging of Phonon Polaritons in a van Der Waals Crystal.” <i>Nanomaterials</i>. MDPI, 2021. <a href=\"https://doi.org/10.3390/nano11010120\">https://doi.org/10.3390/nano11010120</a>."},"isi":1,"external_id":{"pmid":["33430225"],"isi":["000610636600001"]},"publisher":"MDPI","article_type":"original","quality_controlled":"1","file_date_updated":"2021-01-25T08:02:32Z","publication_status":"published","article_processing_charge":"No","department":[{"_id":"NanoFab"}],"date_created":"2021-01-24T23:01:09Z","title":"Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal","intvolume":"        11","pmid":1,"_id":"9038","scopus_import":"1","author":[{"full_name":"Aguilar-Merino, Patricia","last_name":"Aguilar-Merino","first_name":"Patricia"},{"first_name":"Gonzalo","last_name":"Álvarez-Pérez","full_name":"Álvarez-Pérez, Gonzalo"},{"last_name":"Taboada-Gutiérrez","first_name":"Javier","full_name":"Taboada-Gutiérrez, Javier"},{"first_name":"Jiahua","last_name":"Duan","full_name":"Duan, Jiahua"},{"full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357","last_name":"Prieto Gonzalez","first_name":"Ivan","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Álvarez-Prado","first_name":"Luis Manuel","full_name":"Álvarez-Prado, Luis Manuel"},{"full_name":"Nikitin, Alexey Y.","first_name":"Alexey Y.","last_name":"Nikitin"},{"first_name":"Javier","last_name":"Martín-Sánchez","full_name":"Martín-Sánchez, Javier"},{"last_name":"Alonso-González","first_name":"Pablo","full_name":"Alonso-González, Pablo"}],"issue":"1","file":[{"relation":"main_file","success":1,"access_level":"open_access","file_id":"9042","creator":"dernst","date_created":"2021-01-25T08:02:32Z","file_size":2730267,"checksum":"1edc13eeda83df5cd9fff9504727b1f5","date_updated":"2021-01-25T08:02:32Z","content_type":"application/pdf","file_name":"2020_Nanomaterials_Aguilar_Merino.pdf"}],"status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publication_identifier":{"eissn":["20794991"]},"oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"date_published":"2021-01-07T00:00:00Z","type":"journal_article","language":[{"iso":"eng"}],"oa_version":"Published Version","month":"01","article_number":"120","publication":"Nanomaterials","has_accepted_license":"1"},{"oa_version":"Published Version","month":"04","article_number":"eabf2690","publication":"Science Advances","has_accepted_license":"1","language":[{"iso":"eng"}],"publication_identifier":{"eissn":["23752548"]},"oa":1,"tmp":{"name":"Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)","image":"/images/cc_by_nc.png","short":"CC BY-NC (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc/4.0/legalcode"},"date_published":"2021-04-02T00:00:00Z","type":"journal_article","file":[{"access_level":"open_access","relation":"main_file","success":1,"file_id":"9343","creator":"dernst","date_created":"2021-04-19T11:17:29Z","file_size":717489,"checksum":"4b383d4a1d484a71bbc64ecf401bbdbb","date_updated":"2021-04-19T11:17:29Z","file_name":"2021_ScienceAdv_Duan.pdf","content_type":"application/pdf"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","status":"public","publication_status":"published","date_created":"2021-04-18T22:01:42Z","article_processing_charge":"No","department":[{"_id":"NanoFab"}],"title":"Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition","intvolume":"         7","_id":"9334","pmid":1,"scopus_import":"1","author":[{"last_name":"Duan","first_name":"J.","full_name":"Duan, J."},{"last_name":"Álvarez-Pérez","first_name":"G.","full_name":"Álvarez-Pérez, G."},{"last_name":"Voronin","first_name":"K. V.","full_name":"Voronin, K. V."},{"first_name":"Ivan","last_name":"Prieto Gonzalez","orcid":"0000-0002-7370-5357","full_name":"Prieto Gonzalez, Ivan","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Taboada-Gutiérrez","first_name":"J.","full_name":"Taboada-Gutiérrez, J."},{"full_name":"Volkov, V. S.","first_name":"V. S.","last_name":"Volkov"},{"full_name":"Martín-Sánchez, J.","first_name":"J.","last_name":"Martín-Sánchez"},{"full_name":"Nikitin, A. Y.","first_name":"A. Y.","last_name":"Nikitin"},{"last_name":"Alonso-González","first_name":"P.","full_name":"Alonso-González, P."}],"issue":"14","publisher":"AAAS","article_type":"original","quality_controlled":"1","file_date_updated":"2021-04-19T11:17:29Z","doi":"10.1126/sciadv.abf2690","day":"02","abstract":[{"lang":"eng","text":"Polaritons with directional in-plane propagation and ultralow losses in van der Waals (vdW) crystals promise unprecedented manipulation of light at the nanoscale. However, these polaritons present a crucial limitation: their directional propagation is intrinsically determined by the crystal structure of the host material, imposing forbidden directions of propagation. Here, we demonstrate that directional polaritons (in-plane hyperbolic phonon polaritons) in a vdW crystal (α-phase molybdenum trioxide) can be directed along forbidden directions by inducing an optical topological transition, which emerges when the slab is placed on a substrate with a given negative permittivity (4H–silicon carbide). By visualizing the transition in real space, we observe exotic polaritonic states between mutually orthogonal hyperbolic regimes, which unveil the topological origin of the transition: a gap opening in the dispersion. This work provides insights into optical topological transitions in vdW crystals, which introduce a route to direct light at the nanoscale."}],"date_updated":"2023-08-08T13:11:31Z","citation":{"short":"J. Duan, G. Álvarez-Pérez, K.V. Voronin, I. Prieto Gonzalez, J. Taboada-Gutiérrez, V.S. Volkov, J. Martín-Sánchez, A.Y. Nikitin, P. Alonso-González, Science Advances 7 (2021).","mla":"Duan, J., et al. “Enabling Propagation of Anisotropic Polaritons along Forbidden Directions via a Topological Transition.” <i>Science Advances</i>, vol. 7, no. 14, eabf2690, AAAS, 2021, doi:<a href=\"https://doi.org/10.1126/sciadv.abf2690\">10.1126/sciadv.abf2690</a>.","ista":"Duan J, Álvarez-Pérez G, Voronin KV, Prieto Gonzalez I, Taboada-Gutiérrez J, Volkov VS, Martín-Sánchez J, Nikitin AY, Alonso-González P. 2021. Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. Science Advances. 7(14), eabf2690.","ama":"Duan J, Álvarez-Pérez G, Voronin KV, et al. Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. <i>Science Advances</i>. 2021;7(14). doi:<a href=\"https://doi.org/10.1126/sciadv.abf2690\">10.1126/sciadv.abf2690</a>","apa":"Duan, J., Álvarez-Pérez, G., Voronin, K. V., Prieto Gonzalez, I., Taboada-Gutiérrez, J., Volkov, V. S., … Alonso-González, P. (2021). Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition. <i>Science Advances</i>. AAAS. <a href=\"https://doi.org/10.1126/sciadv.abf2690\">https://doi.org/10.1126/sciadv.abf2690</a>","ieee":"J. Duan <i>et al.</i>, “Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition,” <i>Science Advances</i>, vol. 7, no. 14. AAAS, 2021.","chicago":"Duan, J., G. Álvarez-Pérez, K. V. Voronin, Ivan Prieto Gonzalez, J. Taboada-Gutiérrez, V. S. Volkov, J. Martín-Sánchez, A. Y. Nikitin, and P. Alonso-González. “Enabling Propagation of Anisotropic Polaritons along Forbidden Directions via a Topological Transition.” <i>Science Advances</i>. AAAS, 2021. <a href=\"https://doi.org/10.1126/sciadv.abf2690\">https://doi.org/10.1126/sciadv.abf2690</a>."},"year":"2021","isi":1,"external_id":{"pmid":["33811076"],"isi":["000636455600027"]},"acknowledgement":"G.Á.-P. and J.T.-G. acknowledge support through the Severo Ochoa Program from the government of the Principality of Asturias (grant nos. PA20-PF-BP19-053 and PA-18-PF-BP17-126, respectively). K.V.V. and V.S.V. acknowledge the Ministry of Science and Higher Education of the Russian Federation (no. 0714-2020-0002). J. M.-S. acknowledges financial support through the Ramón y Cajal Program from the government of Spain and FSE (RYC2018-026196-I). A.Y.N. acknowledges the Spanish Ministry of Science, Innovation and Universities (national project no. MAT201788358-C3-3-R), and the Basque Department of Education (PIBA-2020-1-0014). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA. ","volume":7,"ddc":["530"]},{"language":[{"iso":"eng"}],"oa_version":"Published Version","article_number":"abj0127","month":"10","has_accepted_license":"1","publication":"Science Advances","file":[{"relation":"main_file","success":1,"access_level":"open_access","file_id":"10189","creator":"cziletti","date_created":"2021-10-27T14:16:06Z","file_size":2441163,"checksum":"0a470ef6a47d2b8a96ede4c4d28cfacd","date_updated":"2021-10-27T14:16:06Z","content_type":"application/pdf","file_name":"2021_ScienceAdv_Martin-Sanchez.pdf"}],"status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publication_identifier":{"eissn":["23752548"]},"oa":1,"tmp":{"name":"Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)","image":"/images/cc_by_nc.png","short":"CC BY-NC (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc/4.0/legalcode"},"type":"journal_article","date_published":"2021-10-08T00:00:00Z","publisher":"American Association for the Advancement of Science","article_type":"original","quality_controlled":"1","file_date_updated":"2021-10-27T14:16:06Z","department":[{"_id":"NanoFab"}],"date_created":"2021-10-24T22:01:33Z","article_processing_charge":"Yes","publication_status":"published","intvolume":"         7","title":"Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas","scopus_import":"1","_id":"10177","issue":"41","author":[{"first_name":"Javier","last_name":"Martín-Sánchez","full_name":"Martín-Sánchez, Javier"},{"full_name":"Duan, Jiahua","first_name":"Jiahua","last_name":"Duan"},{"full_name":"Taboada-Gutiérrez, Javier","last_name":"Taboada-Gutiérrez","first_name":"Javier"},{"full_name":"Álvarez-Pérez, Gonzalo","last_name":"Álvarez-Pérez","first_name":"Gonzalo"},{"first_name":"Kirill V.","last_name":"Voronin","full_name":"Voronin, Kirill V."},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","first_name":"Ivan","last_name":"Prieto Gonzalez","orcid":"0000-0002-7370-5357","full_name":"Prieto Gonzalez, Ivan"},{"full_name":"Ma, Weiliang","first_name":"Weiliang","last_name":"Ma"},{"first_name":"Qiaoliang","last_name":"Bao","full_name":"Bao, Qiaoliang"},{"full_name":"Volkov, Valentyn S.","last_name":"Volkov","first_name":"Valentyn S."},{"full_name":"Hillenbrand, Rainer","first_name":"Rainer","last_name":"Hillenbrand"},{"full_name":"Nikitin, Alexey Y.","last_name":"Nikitin","first_name":"Alexey Y."},{"last_name":"Alonso-González","first_name":"Pablo","full_name":"Alonso-González, Pablo"}],"acknowledgement":"J.M.-S. acknowledges financial support from the Ramón y Cajal Program of the Government of Spain and FSE (RYC2018-026196-I) and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-110308GA-I00). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA, and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-111156GB-I00). J.T.-G. acknowledges support through the Severo Ochoa Program from the Government of the Principality of Asturias (PA-18-PF-BP17-126). G.A.-P. acknowledges support through the Severo Ochoa Program from the Government of the Principality of Asturias (PA-20-PF-BP19-053). K.V.V. and V.S.V. acknowledge the financial support from the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-15-2021-606). A.Y.N. acknowledges the Spanish Ministry of Science, Innovation, and Universities (national projects MAT2017-88358-C3-3-R and PID2020-115221GB-C42) and the Basque Department of Education (PIBA-2020-1-0014). R.H. acknowledges financial support from the Spanish Ministry of Science, Innovation, and Universities (national project number RTI2018-094830-B-100 and project number MDM-2016-0618 of the Marie de Maeztu Units of Excellence Program) and the Basque Government (grant number IT1164-19).","volume":7,"ddc":["530"],"day":"08","arxiv":1,"doi":"10.1126/sciadv.abj0127","abstract":[{"lang":"eng","text":"Phonon polaritons (PhPs)—light coupled to lattice vibrations—with in-plane hyperbolic dispersion exhibit ray-like propagation with large wave vectors and enhanced density of optical states along certain directions on a surface. As such, they have raised a surge of interest, promising unprecedented manipulation of infrared light at the nanoscale in a planar circuitry. Here, we demonstrate focusing of in-plane hyperbolic PhPs propagating along thin slabs of α-MoO3. To that end, we developed metallic nanoantennas of convex geometries for both efficient launching and focusing of the polaritons. The foci obtained exhibit enhanced near-field confinement and absorption compared to foci produced by in-plane isotropic PhPs. Foci sizes as small as λp/4.5 = λ0/50 were achieved (λp is the polariton wavelength and λ0 is the photon wavelength). Focusing of in-plane hyperbolic polaritons introduces a first and most basic building block developing planar polariton optics using in-plane anisotropic van der Waals materials."}],"year":"2021","citation":{"ama":"Martín-Sánchez J, Duan J, Taboada-Gutiérrez J, et al. Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas. <i>Science Advances</i>. 2021;7(41). doi:<a href=\"https://doi.org/10.1126/sciadv.abj0127\">10.1126/sciadv.abj0127</a>","apa":"Martín-Sánchez, J., Duan, J., Taboada-Gutiérrez, J., Álvarez-Pérez, G., Voronin, K. V., Prieto Gonzalez, I., … Alonso-González, P. (2021). Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas. <i>Science Advances</i>. American Association for the Advancement of Science. <a href=\"https://doi.org/10.1126/sciadv.abj0127\">https://doi.org/10.1126/sciadv.abj0127</a>","ieee":"J. Martín-Sánchez <i>et al.</i>, “Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas,” <i>Science Advances</i>, vol. 7, no. 41. American Association for the Advancement of Science, 2021.","chicago":"Martín-Sánchez, Javier, Jiahua Duan, Javier Taboada-Gutiérrez, Gonzalo Álvarez-Pérez, Kirill V. Voronin, Ivan Prieto Gonzalez, Weiliang Ma, et al. “Focusing of In-Plane Hyperbolic Polaritons in van Der Waals Crystals with Tailored Infrared Nanoantennas.” <i>Science Advances</i>. American Association for the Advancement of Science, 2021. <a href=\"https://doi.org/10.1126/sciadv.abj0127\">https://doi.org/10.1126/sciadv.abj0127</a>.","mla":"Martín-Sánchez, Javier, et al. “Focusing of In-Plane Hyperbolic Polaritons in van Der Waals Crystals with Tailored Infrared Nanoantennas.” <i>Science Advances</i>, vol. 7, no. 41, abj0127, American Association for the Advancement of Science, 2021, doi:<a href=\"https://doi.org/10.1126/sciadv.abj0127\">10.1126/sciadv.abj0127</a>.","short":"J. Martín-Sánchez, J. Duan, J. Taboada-Gutiérrez, G. Álvarez-Pérez, K.V. Voronin, I. Prieto Gonzalez, W. Ma, Q. Bao, V.S. Volkov, R. Hillenbrand, A.Y. Nikitin, P. Alonso-González, Science Advances 7 (2021).","ista":"Martín-Sánchez J, Duan J, Taboada-Gutiérrez J, Álvarez-Pérez G, Voronin KV, Prieto Gonzalez I, Ma W, Bao Q, Volkov VS, Hillenbrand R, Nikitin AY, Alonso-González P. 2021. Focusing of in-plane hyperbolic polaritons in van der Waals crystals with tailored infrared nanoantennas. Science Advances. 7(41), abj0127."},"date_updated":"2023-08-14T08:04:42Z","external_id":{"arxiv":["2103.10852"],"isi":["000704912700024"]},"isi":1},{"publication":"Physical Review Research","has_accepted_license":"1","month":"04","article_number":"L022005","oa_version":"Published Version","acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"project":[{"_id":"26A151DA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"844511","name":"Majorana bound states in Ge/SiGe heterostructures"},{"call_identifier":"H2020","_id":"237E5020-32DE-11EA-91FC-C7463DDC885E","grant_number":"862046","name":"TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS"}],"language":[{"iso":"eng"}],"keyword":["general engineering"],"date_published":"2021-04-15T00:00:00Z","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"publication_identifier":{"issn":["2643-1564"]},"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","related_material":{"record":[{"id":"8831","relation":"earlier_version","status":"public"},{"relation":"research_data","id":"8834","status":"public"}]},"status":"public","file":[{"content_type":"application/pdf","file_name":"2021_PhysRevResearch_Aggarwal.pdf","date_updated":"2021-12-17T08:12:37Z","file_size":1917512,"checksum":"60a1bc9c9b616b1b155044bb8cfc6484","date_created":"2021-12-17T08:12:37Z","creator":"cchlebak","file_id":"10561","access_level":"open_access","relation":"main_file","success":1}],"author":[{"id":"b22ab905-3539-11eb-84c3-fc159dcd79cb","full_name":"Aggarwal, Kushagra","orcid":"0000-0001-9985-9293","last_name":"Aggarwal","first_name":"Kushagra"},{"full_name":"Hofmann, Andrea C","last_name":"Hofmann","first_name":"Andrea C","id":"340F461A-F248-11E8-B48F-1D18A9856A87"},{"id":"4C473F58-F248-11E8-B48F-1D18A9856A87","full_name":"Jirovec, Daniel","orcid":"0000-0002-7197-4801","last_name":"Jirovec","first_name":"Daniel"},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","last_name":"Prieto Gonzalez","first_name":"Ivan","full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357"},{"first_name":"Amir","last_name":"Sammak","full_name":"Sammak, Amir"},{"last_name":"Botifoll","first_name":"Marc","full_name":"Botifoll, Marc"},{"full_name":"Martí-Sánchez, Sara","first_name":"Sara","last_name":"Martí-Sánchez"},{"first_name":"Menno","last_name":"Veldhorst","full_name":"Veldhorst, Menno"},{"first_name":"Jordi","last_name":"Arbiol","full_name":"Arbiol, Jordi"},{"first_name":"Giordano","last_name":"Scappucci","full_name":"Scappucci, Giordano"},{"full_name":"Danon, Jeroen","last_name":"Danon","first_name":"Jeroen"},{"full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X","last_name":"Katsaros","first_name":"Georgios","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"issue":"2","_id":"10559","scopus_import":"1","title":"Enhancement of proximity-induced superconductivity in a planar Ge hole gas","intvolume":"         3","publication_status":"published","department":[{"_id":"GeKa"}],"article_processing_charge":"No","date_created":"2021-12-16T18:50:57Z","file_date_updated":"2021-12-17T08:12:37Z","ec_funded":1,"quality_controlled":"1","article_type":"original","publisher":"American Physical Society","external_id":{"arxiv":["2012.00322"]},"date_updated":"2024-02-21T12:41:26Z","year":"2021","citation":{"short":"K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M. Botifoll, S. Martí-Sánchez, M. Veldhorst, J. Arbiol, G. Scappucci, J. Danon, G. Katsaros, Physical Review Research 3 (2021).","mla":"Aggarwal, Kushagra, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” <i>Physical Review Research</i>, vol. 3, no. 2, L022005, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevresearch.3.l022005\">10.1103/physrevresearch.3.l022005</a>.","ista":"Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M, Martí-Sánchez S, Veldhorst M, Arbiol J, Scappucci G, Danon J, Katsaros G. 2021. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. Physical Review Research. 3(2), L022005.","apa":"Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A., Botifoll, M., … Katsaros, G. (2021). Enhancement of proximity-induced superconductivity in a planar Ge hole gas. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevresearch.3.l022005\">https://doi.org/10.1103/physrevresearch.3.l022005</a>","ama":"Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity-induced superconductivity in a planar Ge hole gas. <i>Physical Review Research</i>. 2021;3(2). doi:<a href=\"https://doi.org/10.1103/physrevresearch.3.l022005\">10.1103/physrevresearch.3.l022005</a>","chicago":"Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez, Amir Sammak, Marc Botifoll, Sara Martí-Sánchez, et al. “Enhancement of Proximity-Induced Superconductivity in a Planar Ge Hole Gas.” <i>Physical Review Research</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevresearch.3.l022005\">https://doi.org/10.1103/physrevresearch.3.l022005</a>.","ieee":"K. Aggarwal <i>et al.</i>, “Enhancement of proximity-induced superconductivity in a planar Ge hole gas,” <i>Physical Review Research</i>, vol. 3, no. 2. American Physical Society, 2021."},"abstract":[{"text":"Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid superconductor-semiconductor devices. A key challenge towards hybrid Ge-based quantum technologies is the design of high-quality interfaces and superconducting contacts that are robust against magnetic fields. In this work, by combining the assets of aluminum, which provides good contact to the Ge, and niobium, which has a significant superconducting gap, we demonstrate highly transparent low-disordered JoFETs with relatively large ICRN products that are capable of withstanding high magnetic fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs, opening up an avenue to explore topological superconductivity in planar Ge. The persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves the way towards integrating spin qubits and proximity-induced superconductivity on the same chip.","lang":"eng"}],"doi":"10.1103/physrevresearch.3.l022005","arxiv":1,"day":"15","ddc":["620"],"volume":3,"acknowledgement":"This research and related results were made possible with the support of the NOMIS Foundation. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility, the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant agreement No. 844511 Grant Agreement No. 862046. ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autnoma de Barcelona Materials Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza. Authors acknowledge the LMA-INA for offering access to their instruments and expertise. We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001. This project has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No. 823717 ESTEEM3. M.B. acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020 FI 00103. G.S. and M.V. acknowledge support through a projectruimte grant associated with the Netherlands Organization of Scientific Research (NWO). J.D. acknowledges support through FRIPRO-project 274853, which is funded by the Research Council of Norway."},{"month":"07","oa_version":"Preprint","publication":"Nano Letters","keyword":["Mechanical Engineering","Condensed Matter Physics","General Materials Science","General Chemistry","Bioengineering"],"language":[{"iso":"eng"}],"oa":1,"publication_identifier":{"issn":["1530-6984"],"eissn":["1530-6992"]},"type":"journal_article","date_published":"2020-07-01T00:00:00Z","status":"public","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2004.14599"}],"intvolume":"        20","title":"Twisted nano-optics: Manipulating light at the nanoscale with twisted phonon polaritonic slabs","department":[{"_id":"NanoFab"}],"date_created":"2022-03-18T11:37:38Z","article_processing_charge":"No","publication_status":"published","issue":"7","author":[{"full_name":"Duan, Jiahua","last_name":"Duan","first_name":"Jiahua"},{"full_name":"Capote-Robayna, Nathaniel","first_name":"Nathaniel","last_name":"Capote-Robayna"},{"first_name":"Javier","last_name":"Taboada-Gutiérrez","full_name":"Taboada-Gutiérrez, Javier"},{"last_name":"Álvarez-Pérez","first_name":"Gonzalo","full_name":"Álvarez-Pérez, Gonzalo"},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-7370-5357","full_name":"Prieto Gonzalez, Ivan","first_name":"Ivan","last_name":"Prieto Gonzalez"},{"full_name":"Martín-Sánchez, Javier","first_name":"Javier","last_name":"Martín-Sánchez"},{"last_name":"Nikitin","first_name":"Alexey Y.","full_name":"Nikitin, Alexey Y."},{"last_name":"Alonso-González","first_name":"Pablo","full_name":"Alonso-González, Pablo"}],"scopus_import":"1","pmid":1,"_id":"10866","article_type":"original","publisher":"American Chemical Society","quality_controlled":"1","page":"5323-5329","abstract":[{"lang":"eng","text":"Recent discoveries have shown that, when two layers of van der Waals (vdW) materials are superimposed with a relative twist angle between them, the electronic properties of the coupled system can be dramatically altered. Here, we demonstrate that a similar concept can be extended to the optics realm, particularly to propagating phonon polaritons–hybrid light-matter interactions. To do this, we fabricate stacks composed of two twisted slabs of a vdW crystal (α-MoO3) supporting anisotropic phonon polaritons (PhPs), and image the propagation of the latter when launched by localized sources. Our images reveal that, under a critical angle, the PhPs isofrequency curve undergoes a topological transition, in which the propagation of PhPs is strongly guided (canalization regime) along predetermined directions without geometric spreading. These results demonstrate a new degree of freedom (twist angle) for controlling the propagation of polaritons at the nanoscale with potential for nanoimaging, (bio)-sensing, or heat management."}],"day":"01","doi":"10.1021/acs.nanolett.0c01673","arxiv":1,"external_id":{"arxiv":["2004.14599"],"isi":["000548893200082"],"pmid":["32530634"]},"isi":1,"citation":{"ista":"Duan J, Capote-Robayna N, Taboada-Gutiérrez J, Álvarez-Pérez G, Prieto Gonzalez I, Martín-Sánchez J, Nikitin AY, Alonso-González P. 2020. Twisted nano-optics: Manipulating light at the nanoscale with twisted phonon polaritonic slabs. Nano Letters. 20(7), 5323–5329.","mla":"Duan, Jiahua, et al. “Twisted Nano-Optics: Manipulating Light at the Nanoscale with Twisted Phonon Polaritonic Slabs.” <i>Nano Letters</i>, vol. 20, no. 7, American Chemical Society, 2020, pp. 5323–29, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.0c01673\">10.1021/acs.nanolett.0c01673</a>.","short":"J. Duan, N. Capote-Robayna, J. Taboada-Gutiérrez, G. Álvarez-Pérez, I. Prieto Gonzalez, J. Martín-Sánchez, A.Y. Nikitin, P. Alonso-González, Nano Letters 20 (2020) 5323–5329.","chicago":"Duan, Jiahua, Nathaniel Capote-Robayna, Javier Taboada-Gutiérrez, Gonzalo Álvarez-Pérez, Ivan Prieto Gonzalez, Javier Martín-Sánchez, Alexey Y. Nikitin, and Pablo Alonso-González. “Twisted Nano-Optics: Manipulating Light at the Nanoscale with Twisted Phonon Polaritonic Slabs.” <i>Nano Letters</i>. American Chemical Society, 2020. <a href=\"https://doi.org/10.1021/acs.nanolett.0c01673\">https://doi.org/10.1021/acs.nanolett.0c01673</a>.","ieee":"J. Duan <i>et al.</i>, “Twisted nano-optics: Manipulating light at the nanoscale with twisted phonon polaritonic slabs,” <i>Nano Letters</i>, vol. 20, no. 7. American Chemical Society, pp. 5323–5329, 2020.","apa":"Duan, J., Capote-Robayna, N., Taboada-Gutiérrez, J., Álvarez-Pérez, G., Prieto Gonzalez, I., Martín-Sánchez, J., … Alonso-González, P. (2020). Twisted nano-optics: Manipulating light at the nanoscale with twisted phonon polaritonic slabs. <i>Nano Letters</i>. American Chemical Society. <a href=\"https://doi.org/10.1021/acs.nanolett.0c01673\">https://doi.org/10.1021/acs.nanolett.0c01673</a>","ama":"Duan J, Capote-Robayna N, Taboada-Gutiérrez J, et al. Twisted nano-optics: Manipulating light at the nanoscale with twisted phonon polaritonic slabs. <i>Nano Letters</i>. 2020;20(7):5323-5329. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.0c01673\">10.1021/acs.nanolett.0c01673</a>"},"year":"2020","date_updated":"2023-09-05T12:05:58Z","volume":20,"acknowledgement":"J.T.-G. and G.Á.-P. acknowledge support through the Severo Ochoa Program from the\r\nGovernment of the Principality of Asturias (nos. PA-18-PF-BP17-126 and PA20-PF-BP19-053,\r\nrespectively). J. M-S acknowledges financial support through the Ramón y Cajal Program from\r\nthe Government of Spain (RYC2018-026196-I). A.Y.N. acknowledges the Spanish Ministry of\r\nScience, Innovation and Universities (national project no. MAT201788358-C3-3-R). P.A.-G.\r\nacknowledges support from the European Research Council under starting grant no. 715496,\r\n2DNANOPTICA."},{"oa_version":"None","month":"09","publication":"Nature Materials","language":[{"iso":"eng"}],"publication_identifier":{"eissn":["14764660"],"issn":["14761122"]},"date_published":"2020-09-01T00:00:00Z","type":"journal_article","status":"public","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publication_status":"published","department":[{"_id":"NanoFab"}],"article_processing_charge":"No","date_created":"2020-05-03T22:00:49Z","title":"Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation","intvolume":"        19","_id":"7792","pmid":1,"scopus_import":"1","author":[{"full_name":"Taboada-Gutiérrez, Javier","first_name":"Javier","last_name":"Taboada-Gutiérrez"},{"first_name":"Gonzalo","last_name":"Álvarez-Pérez","full_name":"Álvarez-Pérez, Gonzalo"},{"first_name":"Jiahua","last_name":"Duan","full_name":"Duan, Jiahua"},{"full_name":"Ma, Weiliang","first_name":"Weiliang","last_name":"Ma"},{"first_name":"Kyle","last_name":"Crowley","full_name":"Crowley, Kyle"},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","first_name":"Ivan","last_name":"Prieto Gonzalez","orcid":"0000-0002-7370-5357","full_name":"Prieto Gonzalez, Ivan"},{"full_name":"Bylinkin, Andrei","last_name":"Bylinkin","first_name":"Andrei"},{"full_name":"Autore, Marta","first_name":"Marta","last_name":"Autore"},{"full_name":"Volkova, Halyna","first_name":"Halyna","last_name":"Volkova"},{"full_name":"Kimura, Kenta","first_name":"Kenta","last_name":"Kimura"},{"last_name":"Kimura","first_name":"Tsuyoshi","full_name":"Kimura, Tsuyoshi"},{"last_name":"Berger","first_name":"M. H.","full_name":"Berger, M. H."},{"first_name":"Shaojuan","last_name":"Li","full_name":"Li, Shaojuan"},{"full_name":"Bao, Qiaoliang","last_name":"Bao","first_name":"Qiaoliang"},{"last_name":"Gao","first_name":"Xuan P.A.","full_name":"Gao, Xuan P.A."},{"last_name":"Errea","first_name":"Ion","full_name":"Errea, Ion"},{"full_name":"Nikitin, Alexey Y.","first_name":"Alexey Y.","last_name":"Nikitin"},{"full_name":"Hillenbrand, Rainer","last_name":"Hillenbrand","first_name":"Rainer"},{"full_name":"Martín-Sánchez, Javier","last_name":"Martín-Sánchez","first_name":"Javier"},{"first_name":"Pablo","last_name":"Alonso-González","full_name":"Alonso-González, Pablo"}],"publisher":"Springer Nature","article_type":"original","page":"964–968","quality_controlled":"1","doi":"10.1038/s41563-020-0665-0","day":"01","abstract":[{"lang":"eng","text":"Phonon polaritons—light coupled to lattice vibrations—in polar van der Waals crystals are promising candidates for controlling the flow of energy on the nanoscale due to their strong field confinement, anisotropic propagation and ultra-long lifetime in the picosecond range1,2,3,4,5. However, the lack of tunability of their narrow and material-specific spectral range—the Reststrahlen band—severely limits their technological implementation. Here, we demonstrate that intercalation of Na atoms in the van der Waals semiconductor α-V2O5 enables a broad spectral shift of Reststrahlen bands, and that the phonon polaritons excited show ultra-low losses (lifetime of 4 ± 1 ps), similar to phonon polaritons in a non-intercalated crystal (lifetime of 6 ± 1 ps). We expect our intercalation method to be applicable to other van der Waals crystals, opening the door for the use of phonon polaritons in broad spectral bands in the mid-infrared domain."}],"date_updated":"2023-08-21T06:18:20Z","citation":{"ista":"Taboada-Gutiérrez J, Álvarez-Pérez G, Duan J, Ma W, Crowley K, Prieto Gonzalez I, Bylinkin A, Autore M, Volkova H, Kimura K, Kimura T, Berger MH, Li S, Bao Q, Gao XPA, Errea I, Nikitin AY, Hillenbrand R, Martín-Sánchez J, Alonso-González P. 2020. Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation. Nature Materials. 19, 964–968.","short":"J. Taboada-Gutiérrez, G. Álvarez-Pérez, J. Duan, W. Ma, K. Crowley, I. Prieto Gonzalez, A. Bylinkin, M. Autore, H. Volkova, K. Kimura, T. Kimura, M.H. Berger, S. Li, Q. Bao, X.P.A. Gao, I. Errea, A.Y. Nikitin, R. Hillenbrand, J. Martín-Sánchez, P. Alonso-González, Nature Materials 19 (2020) 964–968.","mla":"Taboada-Gutiérrez, Javier, et al. “Broad Spectral Tuning of Ultra-Low-Loss Polaritons in a van Der Waals Crystal by Intercalation.” <i>Nature Materials</i>, vol. 19, Springer Nature, 2020, pp. 964–968, doi:<a href=\"https://doi.org/10.1038/s41563-020-0665-0\">10.1038/s41563-020-0665-0</a>.","ieee":"J. Taboada-Gutiérrez <i>et al.</i>, “Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation,” <i>Nature Materials</i>, vol. 19. Springer Nature, pp. 964–968, 2020.","chicago":"Taboada-Gutiérrez, Javier, Gonzalo Álvarez-Pérez, Jiahua Duan, Weiliang Ma, Kyle Crowley, Ivan Prieto Gonzalez, Andrei Bylinkin, et al. “Broad Spectral Tuning of Ultra-Low-Loss Polaritons in a van Der Waals Crystal by Intercalation.” <i>Nature Materials</i>. Springer Nature, 2020. <a href=\"https://doi.org/10.1038/s41563-020-0665-0\">https://doi.org/10.1038/s41563-020-0665-0</a>.","apa":"Taboada-Gutiérrez, J., Álvarez-Pérez, G., Duan, J., Ma, W., Crowley, K., Prieto Gonzalez, I., … Alonso-González, P. (2020). Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation. <i>Nature Materials</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41563-020-0665-0\">https://doi.org/10.1038/s41563-020-0665-0</a>","ama":"Taboada-Gutiérrez J, Álvarez-Pérez G, Duan J, et al. Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation. <i>Nature Materials</i>. 2020;19:964–968. doi:<a href=\"https://doi.org/10.1038/s41563-020-0665-0\">10.1038/s41563-020-0665-0</a>"},"year":"2020","isi":1,"external_id":{"pmid":["32284598"],"isi":["000526218500004"]},"volume":19,"acknowledgement":"J.T.-G. and G.Á.-P. acknowledge support through the Severo Ochoa Program from the Government of the Principality of Asturias (nos. PA-18-PF-BP17-126 and PA-20-PF-BP19-053, respectively). J.M.-S. acknowledges finantial support from the Clarín Programme from the Government of the Principality of Asturias and a Marie Curie-COFUND grant (PA-18-ACB17-29) and the Ramón y Cajal Program from the Government of Spain (RYC2018-026196-I). K.C., X.P.A.G., H.V. and M.H.B. acknowledge the Air Force Office of Scientific Research (AFOSR) grant no. FA 9550-18-1-0030 for funding support. I.E. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (grant no. FIS2016-76617-P). A.Y.N. acknowledges the Spanish Ministry of Science, Innovation and Universities (national project no. MAT2017-88358-C3-3-R) and the Basque Government (grant no. IT1164-19). Q.B. acknowledges the support from Australian Research Council (grant nos. FT150100450, IH150100006 and CE170100039). R.H. acknowledges support from the Spanish Ministry of Economy, Industry, and Competitiveness (national project RTI2018-094830-B-100 and the Project MDM-2016-0618 of the María de Maeztu Units of Excellence Program) and the Basque Goverment (grant no. IT1164-19). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA."},{"date_updated":"2024-03-25T23:30:14Z","year":"2020","citation":{"short":"K. Aggarwal, A.C. Hofmann, D. Jirovec, I. Prieto Gonzalez, A. Sammak, M. Botifoll, S. Marti-Sanchez, M. Veldhorst, J. Arbiol, G. Scappucci, G. Katsaros, ArXiv (n.d.).","mla":"Aggarwal, Kushagra, et al. “Enhancement of Proximity Induced Superconductivity in Planar Germanium.” <i>ArXiv</i>, 2012.00322.","ista":"Aggarwal K, Hofmann AC, Jirovec D, Prieto Gonzalez I, Sammak A, Botifoll M, Marti-Sanchez S, Veldhorst M, Arbiol J, Scappucci G, Katsaros G. Enhancement of proximity induced superconductivity in planar Germanium. arXiv, 2012.00322.","ama":"Aggarwal K, Hofmann AC, Jirovec D, et al. Enhancement of proximity induced superconductivity in planar Germanium. <i>arXiv</i>.","apa":"Aggarwal, K., Hofmann, A. C., Jirovec, D., Prieto Gonzalez, I., Sammak, A., Botifoll, M., … Katsaros, G. (n.d.). Enhancement of proximity induced superconductivity in planar Germanium. <i>arXiv</i>.","ieee":"K. Aggarwal <i>et al.</i>, “Enhancement of proximity induced superconductivity in planar Germanium,” <i>arXiv</i>. .","chicago":"Aggarwal, Kushagra, Andrea C Hofmann, Daniel Jirovec, Ivan Prieto Gonzalez, Amir Sammak, Marc Botifoll, Sara Marti-Sanchez, et al. “Enhancement of Proximity Induced Superconductivity in Planar Germanium.” <i>ArXiv</i>, n.d."},"external_id":{"arxiv":["2012.00322"]},"arxiv":1,"day":"02","abstract":[{"text":"Holes in planar Ge have high mobilities, strong spin-orbit interaction and electrically tunable g-factors, and are therefore emerging as a promising candidate for hybrid superconductorsemiconductor devices. This is further motivated by the observation of supercurrent transport in planar Ge Josephson Field effect transistors (JoFETs). A key challenge towards hybrid germanium quantum technology is the design of high quality interfaces and superconducting contacts that are robust against magnetic fields. By combining the assets of Al, which has a long superconducting coherence, and Nb, which has a significant superconducting gap, we form low-disordered JoFETs with large ICRN products that are capable of withstanding high magnetic fields. We furthermore demonstrate the ability of phase-biasing individual JoFETs opening up an avenue to explore topological superconductivity in planar Ge. The persistence of superconductivity in the reported hybrid devices beyond 1.8 T paves the way towards integrating spin qubits and proximity-induced superconductivity on the same chip.","lang":"eng"}],"acknowledgement":"This research and related results were made possible with the support of the NOMIS Foundation. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility, the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement #844511 and the Grant Agreement #862046. ICN2 acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa\r\nprogram from Spanish MINECO (Grant No. SEV2017-0706) and is funded by the CERCA Programme / Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Aut`onoma de Barcelona Materials Science PhD program. The HAADF-STEM microscopy was conducted in the Laboratorio de Microscopias Avanzadas at Instituto de Nanociencia de Aragon-Universidad de Zaragoza. Authors acknowledge the LMA-INA for offering access to their instruments and expertise. We acknowledge support from CSIC Research Platform on Quantum Technologies PTI-001. This project has received funding from\r\nthe European Union’s Horizon 2020 research and innovation programme under grant agreement No 823717 – ESTEEM3. M.B. acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020 FI 00103. GS and MV acknowledge support through a projectruimte grant associated with the Netherlands Organization of Scientific Research (NWO).","ddc":["530"],"_id":"8831","author":[{"id":"b22ab905-3539-11eb-84c3-fc159dcd79cb","orcid":"0000-0001-9985-9293","full_name":"Aggarwal, Kushagra","first_name":"Kushagra","last_name":"Aggarwal"},{"last_name":"Hofmann","first_name":"Andrea C","full_name":"Hofmann, Andrea C","id":"340F461A-F248-11E8-B48F-1D18A9856A87"},{"id":"4C473F58-F248-11E8-B48F-1D18A9856A87","first_name":"Daniel","last_name":"Jirovec","orcid":"0000-0002-7197-4801","full_name":"Jirovec, Daniel"},{"id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","last_name":"Prieto Gonzalez","first_name":"Ivan","full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357"},{"full_name":"Sammak, Amir","first_name":"Amir","last_name":"Sammak"},{"first_name":"Marc","last_name":"Botifoll","full_name":"Botifoll, Marc"},{"last_name":"Marti-Sanchez","first_name":"Sara","full_name":"Marti-Sanchez, Sara"},{"last_name":"Veldhorst","first_name":"Menno","full_name":"Veldhorst, Menno"},{"last_name":"Arbiol","first_name":"Jordi","full_name":"Arbiol, Jordi"},{"first_name":"Giordano","last_name":"Scappucci","full_name":"Scappucci, Giordano"},{"first_name":"Georgios","last_name":"Katsaros","orcid":"0000-0001-8342-202X","full_name":"Katsaros, Georgios","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"publication_status":"submitted","article_processing_charge":"No","department":[{"_id":"GeKa"}],"date_created":"2020-12-02T10:42:53Z","title":"Enhancement of proximity induced superconductivity in planar Germanium","ec_funded":1,"file_date_updated":"2020-12-02T10:42:31Z","date_published":"2020-12-02T00:00:00Z","type":"preprint","oa":1,"file":[{"file_id":"8832","creator":"gkatsaro","relation":"main_file","access_level":"open_access","date_updated":"2020-12-02T10:42:31Z","file_name":"Superconducting_2D_Ge.pdf","content_type":"application/pdf","date_created":"2020-12-02T10:42:31Z","file_size":1697939,"checksum":"22a612e206232fa94b138b2c2f957582"}],"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","related_material":{"record":[{"status":"public","id":"10559","relation":"later_version"},{"status":"public","id":"8834","relation":"research_data"},{"id":"10058","relation":"dissertation_contains","status":"public"}]},"publication":"arXiv","has_accepted_license":"1","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"oa_version":"Submitted Version","project":[{"name":"Hybrid Semiconductor - Superconductor Quantum Devices","_id":"262116AA-B435-11E9-9278-68D0E5697425"},{"grant_number":"844511","name":"Majorana bound states in Ge/SiGe heterostructures","_id":"26A151DA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"},{"_id":"237E5020-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","grant_number":"862046","name":"TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS"}],"month":"12","article_number":"2012.00322","language":[{"iso":"eng"}]},{"oa":1,"type":"preprint","date_published":"2019-10-13T00:00:00Z","main_file_link":[{"url":"https://arxiv.org/abs/1910.05841","open_access":"1"}],"related_material":{"record":[{"id":"10058","relation":"dissertation_contains","status":"public"}]},"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"call_identifier":"H2020","_id":"26A151DA-B435-11E9-9278-68D0E5697425","name":"Majorana bound states in Ge/SiGe heterostructures","grant_number":"844511"},{"_id":"2641CE5E-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Hole spin orbit qubits in Ge quantum wells","grant_number":"P30207"}],"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"oa_version":"Preprint","article_number":"1910.05841","month":"10","publication":"arXiv","language":[{"iso":"eng"}],"day":"13","doi":"10.48550/arXiv.1910.05841","arxiv":1,"abstract":[{"text":"We study double quantum dots in a Ge/SiGe heterostructure and test their maturity towards singlet-triplet ($S-T_0$) qubits. We demonstrate a large range of tunability, from two single quantum dots to a double quantum dot. We measure Pauli spin blockade and study the anisotropy of the $g$-factor. We use an adjacent quantum dot for sensing charge transitions in the double quantum dot at interest. In conclusion, Ge/SiGe possesses all ingredients necessary for building a singlet-triplet qubit.","lang":"eng"}],"citation":{"ista":"Hofmann AC, Jirovec D, Borovkov M, Prieto Gonzalez I, Ballabio A, Frigerio J, Chrastina D, Isella G, Katsaros G. Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. arXiv, 1910.05841.","short":"A.C. Hofmann, D. Jirovec, M. Borovkov, I. Prieto Gonzalez, A. Ballabio, J. Frigerio, D. Chrastina, G. Isella, G. Katsaros, ArXiv (n.d.).","mla":"Hofmann, Andrea C., et al. “Assessing the Potential of Ge/SiGe Quantum Dots as Hosts for Singlet-Triplet Qubits.” <i>ArXiv</i>, 1910.05841, doi:<a href=\"https://doi.org/10.48550/arXiv.1910.05841\">10.48550/arXiv.1910.05841</a>.","chicago":"Hofmann, Andrea C, Daniel Jirovec, Maxim Borovkov, Ivan Prieto Gonzalez, Andrea Ballabio, Jacopo Frigerio, Daniel Chrastina, Giovanni Isella, and Georgios Katsaros. “Assessing the Potential of Ge/SiGe Quantum Dots as Hosts for Singlet-Triplet Qubits.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.1910.05841\">https://doi.org/10.48550/arXiv.1910.05841</a>.","ieee":"A. C. Hofmann <i>et al.</i>, “Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits,” <i>arXiv</i>. .","ama":"Hofmann AC, Jirovec D, Borovkov M, et al. Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.1910.05841\">10.48550/arXiv.1910.05841</a>","apa":"Hofmann, A. C., Jirovec, D., Borovkov, M., Prieto Gonzalez, I., Ballabio, A., Frigerio, J., … Katsaros, G. (n.d.). Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.1910.05841\">https://doi.org/10.48550/arXiv.1910.05841</a>"},"year":"2019","date_updated":"2024-03-25T23:30:14Z","external_id":{"arxiv":["1910.05841"]},"acknowledgement":"We thank Matthias Brauns for helpful discussions and careful proofreading of the manuscript. This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No 844511 and from the FWF project P30207. The research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA machine shop and the nanofabrication\r\nfacility.","article_processing_charge":"No","date_created":"2021-10-01T12:14:51Z","department":[{"_id":"GeKa"}],"publication_status":"submitted","title":"Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits","_id":"10065","author":[{"first_name":"Andrea C","last_name":"Hofmann","full_name":"Hofmann, Andrea C","id":"340F461A-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0002-7197-4801","full_name":"Jirovec, Daniel","first_name":"Daniel","last_name":"Jirovec","id":"4C473F58-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Borovkov, Maxim","last_name":"Borovkov","first_name":"Maxim"},{"last_name":"Prieto Gonzalez","first_name":"Ivan","full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Ballabio, Andrea","first_name":"Andrea","last_name":"Ballabio"},{"last_name":"Frigerio","first_name":"Jacopo","full_name":"Frigerio, Jacopo"},{"first_name":"Daniel","last_name":"Chrastina","full_name":"Chrastina, Daniel"},{"last_name":"Isella","first_name":"Giovanni","full_name":"Isella, Giovanni"},{"id":"38DB5788-F248-11E8-B48F-1D18A9856A87","full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X","last_name":"Katsaros","first_name":"Georgios"}],"ec_funded":1}]