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Institute of Science and Technology Austria, 2023, doi:<a href=\"https://doi.org/10.15479/at:ista:13286\">10.15479/at:ista:13286</a>.","short":"M. Valentini, Mesoscopic Phenomena in Hybrid Semiconductor-Superconductor Nanodevices : From Full-Shell Nanowires to Two-Dimensional Hole Gas in Germanium, Institute of Science and Technology Austria, 2023.","ista":"Valentini M. 2023. Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium. Institute of Science and Technology Austria.","apa":"Valentini, M. (2023). <i>Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:13286\">https://doi.org/10.15479/at:ista:13286</a>","ama":"Valentini M. Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium. 2023. doi:<a href=\"https://doi.org/10.15479/at:ista:13286\">10.15479/at:ista:13286</a>","ieee":"M. Valentini, “Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium,” Institute of Science and Technology Austria, 2023.","chicago":"Valentini, Marco. “Mesoscopic Phenomena in Hybrid Semiconductor-Superconductor Nanodevices : From Full-Shell Nanowires to Two-Dimensional Hole Gas in Germanium.” Institute of Science and Technology Austria, 2023. <a href=\"https://doi.org/10.15479/at:ista:13286\">https://doi.org/10.15479/at:ista:13286</a>."},"year":"2023","date_updated":"2024-02-21T12:35:34Z","day":"21","doi":"10.15479/at:ista:13286","degree_awarded":"PhD","abstract":[{"lang":"eng","text":"Semiconductor-superconductor hybrid systems are the harbour of many intriguing mesoscopic phenomena. This material combination leads to spatial variations of the superconducting properties, which gives rise to Andreev bound states (ABSs). Some of these states might exhibit remarkable properties that render them highly desirable for topological quantum computing. The most prominent and hunted of such states are Majorana zero modes (MZMs), quasiparticles equals to their own quasiparticles that they follow non-abelian statistics. In this thesis, we first introduce the general framework of such hybrid systems and, then, we unveil a series of mesoscopic phenomena that we discovered. Firstly, we show tunneling spectroscopy experiments on full-shell nanowires (NWs) showing that unwanted quantum-dot states coupled to superconductors (Yu-Shiba-Rusinov states) can mimic MZMs signatures. Then, we introduce a novel protocol which allowed the integration of tunneling spectroscopy with Coulomb spectroscopy within the same device. Employing this approach on both full-shell NWs and partial-shell NWs, we demonstrated that longitudinally confined states reveal charge transport phenomenology similar to the one expected for MZMs. These findings shed light on the intricate interplay between superconductivity and quantum confinement, which brought us to explore another material platform, i.e. a two-dimensional Germanium hole gas. After developing a robust way to induce superconductivity in such system, we showed how to engineer the proximity effect and we revealed a superconducting hard gap. Finally, we created a superconducting radio frequency driven ideal diode and a generator of non-sinusoidal current-phase relations. Our results open the path for the exploration of protected superconducting qubits and more complex hybrid devices in planar Germanium, like Kitaev chains and hybrid qubit devices."}],"ec_funded":1,"page":"184","file_date_updated":"2023-08-11T14:39:17Z","publisher":"Institute of Science and Technology Austria","_id":"13286","author":[{"full_name":"Valentini, Marco","first_name":"Marco","last_name":"Valentini","id":"C0BB2FAC-D767-11E9-B658-BC13E6697425"}],"date_created":"2023-07-24T14:10:45Z","department":[{"_id":"GradSch"},{"_id":"GeKa"}],"article_processing_charge":"No","publication_status":"published","title":"Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium","alternative_title":["ISTA Thesis"]},{"author":[{"first_name":"Daniel","last_name":"Jirovec","orcid":"0000-0002-7197-4801","full_name":"Jirovec, Daniel","id":"4C473F58-F248-11E8-B48F-1D18A9856A87"},{"id":"340F461A-F248-11E8-B48F-1D18A9856A87","full_name":"Hofmann, Andrea C","last_name":"Hofmann","first_name":"Andrea C"},{"last_name":"Ballabio","first_name":"Andrea","full_name":"Ballabio, Andrea"},{"first_name":"Philipp M.","last_name":"Mutter","full_name":"Mutter, Philipp M."},{"last_name":"Tavani","first_name":"Giulio","full_name":"Tavani, Giulio"},{"full_name":"Botifoll, Marc","last_name":"Botifoll","first_name":"Marc"},{"id":"1F2B21A2-F6E7-11E9-9B82-F7DBE5697425","full_name":"Crippa, Alessandro","orcid":"0000-0002-2968-611X","last_name":"Crippa","first_name":"Alessandro"},{"full_name":"Kukucka, Josip","last_name":"Kukucka","first_name":"Josip","id":"3F5D8856-F248-11E8-B48F-1D18A9856A87"},{"id":"71616374-A8E9-11E9-A7CA-09ECE5697425","first_name":"Oliver","last_name":"Sagi","full_name":"Sagi, Oliver"},{"id":"38F80F9A-1CB8-11EA-BC76-B49B3DDC885E","full_name":"Martins, Frederico","orcid":"0000-0003-2668-2401","last_name":"Martins","first_name":"Frederico"},{"id":"e0390f72-f6e0-11ea-865d-862393336714","full_name":"Saez Mollejo, Jaime","last_name":"Saez Mollejo","first_name":"Jaime"},{"first_name":"Ivan","last_name":"Prieto Gonzalez","orcid":"0000-0002-7370-5357","full_name":"Prieto Gonzalez, Ivan","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"id":"2ac7a0a2-3562-11eb-9256-fbd18ea55087","full_name":"Borovkov, Maksim","first_name":"Maksim","last_name":"Borovkov"},{"last_name":"Arbiol","first_name":"Jordi","full_name":"Arbiol, Jordi"},{"full_name":"Chrastina, Daniel","last_name":"Chrastina","first_name":"Daniel"},{"full_name":"Isella, Giovanni","last_name":"Isella","first_name":"Giovanni"},{"id":"38DB5788-F248-11E8-B48F-1D18A9856A87","full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X","last_name":"Katsaros","first_name":"Georgios"}],"issue":"8","_id":"8909","scopus_import":"1","title":"A singlet triplet hole spin qubit in planar Ge","intvolume":"        20","publication_status":"published","department":[{"_id":"GeKa"},{"_id":"NanoFab"},{"_id":"GradSch"}],"article_processing_charge":"No","date_created":"2020-12-02T10:50:47Z","page":"1106–1112","quality_controlled":"1","ec_funded":1,"article_type":"original","publisher":"Springer Nature","isi":1,"external_id":{"isi":["000657596400001"],"arxiv":["2011.13755"]},"date_updated":"2024-03-25T23:30:14Z","citation":{"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.","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.","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>","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>","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>."},"year":"2021","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"}],"arxiv":1,"doi":"10.1038/s41563-021-01022-2","day":"01","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.","publication":"Nature Materials","month":"08","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"oa_version":"Preprint","project":[{"call_identifier":"H2020","_id":"26A151DA-B435-11E9-9278-68D0E5697425","grant_number":"844511","name":"Majorana bound states in Ge/SiGe heterostructures"},{"call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411"},{"grant_number":"P30207","name":"Hole spin orbit qubits in Ge quantum wells","call_identifier":"FWF","_id":"2641CE5E-B435-11E9-9278-68D0E5697425"},{"_id":"262116AA-B435-11E9-9278-68D0E5697425","name":"Hybrid Semiconductor - Superconductor Quantum Devices"}],"language":[{"iso":"eng"}],"date_published":"2021-08-01T00:00:00Z","type":"journal_article","oa":1,"publication_identifier":{"eissn":["1476-4660"],"issn":["1476-1122"]},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","status":"public","related_material":{"link":[{"url":"https://ist.ac.at/en/news/quantum-computing-with-holes/","description":"News on IST Homepage","relation":"press_release"}],"record":[{"status":"public","relation":"research_data","id":"9323"},{"status":"public","id":"10058","relation":"dissertation_contains"}]},"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2011.13755"}]},{"arxiv":1,"doi":"10.1126/science.abf1513","day":"02","abstract":[{"text":"A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstrate that the appearance of subgap states in such structures is actually governed by the junction region in tunneling spectroscopy measurements and not the full-shell nanowire itself. Short tunneling regions never show subgap states, whereas longer junctions always do. This can be understood in terms of quantum dots forming in the junction and hosting Andreev levels in the Yu-Shiba-Rusinov regime. The intricate magnetic field dependence of the Andreev levels, through both the Zeeman and Little-Parks effects, may result in robust zero-bias peaks—features that could be easily misinterpreted as originating from Majorana zero modes but are unrelated to topological superconductivity.","lang":"eng"}],"date_updated":"2024-02-21T12:40:09Z","year":"2021","citation":{"ista":"Valentini M, Peñaranda F, Hofmann AC, Brauns M, Hauschild R, Krogstrup P, San-Jose P, Prada E, Aguado R, Katsaros G. 2021. Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. Science. 373(6550), 82–88.","short":"M. Valentini, F. Peñaranda, A.C. Hofmann, M. Brauns, R. Hauschild, P. Krogstrup, P. San-Jose, E. Prada, R. Aguado, G. Katsaros, Science 373 (2021).","mla":"Valentini, Marco, et al. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced by Flux-Tunable Andreev States.” <i>Science</i>, vol. 373, no. 6550, 82–88, American Association for the Advancement of Science, 2021, doi:<a href=\"https://doi.org/10.1126/science.abf1513\">10.1126/science.abf1513</a>.","ieee":"M. Valentini <i>et al.</i>, “Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states,” <i>Science</i>, vol. 373, no. 6550. American Association for the Advancement of Science, 2021.","chicago":"Valentini, Marco, Fernando Peñaranda, Andrea C Hofmann, Matthias Brauns, Robert Hauschild, Peter Krogstrup, Pablo San-Jose, Elsa Prada, Ramón Aguado, and Georgios Katsaros. “Nontopological Zero-Bias Peaks in Full-Shell Nanowires Induced by Flux-Tunable Andreev States.” <i>Science</i>. American Association for the Advancement of Science, 2021. <a href=\"https://doi.org/10.1126/science.abf1513\">https://doi.org/10.1126/science.abf1513</a>.","ama":"Valentini M, Peñaranda F, Hofmann AC, et al. Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. <i>Science</i>. 2021;373(6550). doi:<a href=\"https://doi.org/10.1126/science.abf1513\">10.1126/science.abf1513</a>","apa":"Valentini, M., Peñaranda, F., Hofmann, A. C., Brauns, M., Hauschild, R., Krogstrup, P., … Katsaros, G. (2021). Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states. <i>Science</i>. American Association for the Advancement of Science. <a href=\"https://doi.org/10.1126/science.abf1513\">https://doi.org/10.1126/science.abf1513</a>"},"isi":1,"external_id":{"arxiv":["2008.02348"],"isi":["000677843100034"]},"acknowledgement":"The authors thank A. Higginbotham, E. J. H. Lee and F. R. Martins for helpful discussions. 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 NOMIS Foundation and Microsoft; the European Union’s Horizon 2020 research and innovation program under the Marie SklodowskaCurie grant agreement No 844511; the FETOPEN Grant Agreement No. 828948; the European Research Commission through the grant agreement HEMs-DAM No 716655; the Spanish Ministry of Science and Innovation through Grants PGC2018-097018-B-I00, PCI2018-093026, FIS2016-80434-P (AEI/FEDER, EU), RYC2011-09345 (Ram´on y Cajal Programme), and the Mar´ıa de Maeztu Programme for Units of Excellence in R&D (CEX2018-000805-M); the CSIC Research Platform on Quantum Technologies PTI-001.","volume":373,"publication_status":"published","date_created":"2020-12-02T10:51:52Z","department":[{"_id":"GeKa"},{"_id":"Bio"}],"article_processing_charge":"No","title":"Nontopological zero-bias peaks in full-shell nanowires induced by flux-tunable Andreev states","intvolume":"       373","_id":"8910","scopus_import":"1","author":[{"last_name":"Valentini","first_name":"Marco","full_name":"Valentini, Marco","id":"C0BB2FAC-D767-11E9-B658-BC13E6697425"},{"full_name":"Peñaranda, Fernando","last_name":"Peñaranda","first_name":"Fernando"},{"id":"340F461A-F248-11E8-B48F-1D18A9856A87","first_name":"Andrea C","last_name":"Hofmann","full_name":"Hofmann, Andrea C"},{"full_name":"Brauns, Matthias","last_name":"Brauns","first_name":"Matthias","id":"33F94E3C-F248-11E8-B48F-1D18A9856A87"},{"id":"4E01D6B4-F248-11E8-B48F-1D18A9856A87","first_name":"Robert","last_name":"Hauschild","orcid":"0000-0001-9843-3522","full_name":"Hauschild, Robert"},{"last_name":"Krogstrup","first_name":"Peter","full_name":"Krogstrup, Peter"},{"full_name":"San-Jose, Pablo","first_name":"Pablo","last_name":"San-Jose"},{"last_name":"Prada","first_name":"Elsa","full_name":"Prada, Elsa"},{"full_name":"Aguado, Ramón","first_name":"Ramón","last_name":"Aguado"},{"id":"38DB5788-F248-11E8-B48F-1D18A9856A87","last_name":"Katsaros","first_name":"Georgios","full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X"}],"issue":"6550","publisher":"American Association for the Advancement of Science","article_type":"original","quality_controlled":"1","ec_funded":1,"publication_identifier":{"issn":["00368075"],"eissn":["10959203"]},"oa":1,"date_published":"2021-07-02T00:00:00Z","type":"journal_article","main_file_link":[{"url":"https://arxiv.org/abs/2008.02348","open_access":"1"}],"related_material":{"link":[{"description":"News on IST Homepage","relation":"press_release","url":"https://ist.ac.at/en/news/unfinding-a-split-electron/"}],"record":[{"status":"public","relation":"dissertation_contains","id":"13286"},{"relation":"research_data","id":"9389","status":"public"}]},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","status":"public","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"oa_version":"Submitted Version","project":[{"name":"Hybrid Semiconductor - Superconductor Quantum Devices","_id":"262116AA-B435-11E9-9278-68D0E5697425"},{"name":"Majorana bound states in Ge/SiGe heterostructures","grant_number":"844511","_id":"26A151DA-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"month":"07","article_number":"82-88","publication":"Science","language":[{"iso":"eng"}]},{"date_published":"2020-12-02T00:00:00Z","type":"preprint","oa":1,"file":[{"creator":"gkatsaro","file_id":"8832","access_level":"open_access","relation":"main_file","file_name":"Superconducting_2D_Ge.pdf","content_type":"application/pdf","date_updated":"2020-12-02T10:42:31Z","file_size":1697939,"checksum":"22a612e206232fa94b138b2c2f957582","date_created":"2020-12-02T10:42:31Z"}],"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","related_material":{"record":[{"status":"public","id":"10559","relation":"later_version"},{"status":"public","relation":"research_data","id":"8834"},{"id":"10058","relation":"dissertation_contains","status":"public"}]},"publication":"arXiv","has_accepted_license":"1","oa_version":"Submitted Version","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"project":[{"_id":"262116AA-B435-11E9-9278-68D0E5697425","name":"Hybrid Semiconductor - Superconductor Quantum Devices"},{"_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","name":"TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS","grant_number":"862046"}],"month":"12","article_number":"2012.00322","language":[{"iso":"eng"}],"date_updated":"2024-03-25T23:30:14Z","year":"2020","citation":{"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.","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>.","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.","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."},"external_id":{"arxiv":["2012.00322"]},"arxiv":1,"day":"02","abstract":[{"lang":"eng","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."}],"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","last_name":"Aggarwal","first_name":"Kushagra","full_name":"Aggarwal, Kushagra","orcid":"0000-0001-9985-9293"},{"id":"340F461A-F248-11E8-B48F-1D18A9856A87","full_name":"Hofmann, Andrea C","first_name":"Andrea C","last_name":"Hofmann"},{"id":"4C473F58-F248-11E8-B48F-1D18A9856A87","last_name":"Jirovec","first_name":"Daniel","full_name":"Jirovec, Daniel","orcid":"0000-0002-7197-4801"},{"full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357","last_name":"Prieto Gonzalez","first_name":"Ivan","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Amir","last_name":"Sammak","full_name":"Sammak, Amir"},{"full_name":"Botifoll, Marc","first_name":"Marc","last_name":"Botifoll"},{"first_name":"Sara","last_name":"Marti-Sanchez","full_name":"Marti-Sanchez, Sara"},{"full_name":"Veldhorst, Menno","first_name":"Menno","last_name":"Veldhorst"},{"full_name":"Arbiol, Jordi","last_name":"Arbiol","first_name":"Jordi"},{"first_name":"Giordano","last_name":"Scappucci","full_name":"Scappucci, Giordano"},{"last_name":"Katsaros","first_name":"Georgios","full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"publication_status":"submitted","date_created":"2020-12-02T10:42:53Z","article_processing_charge":"No","department":[{"_id":"GeKa"}],"title":"Enhancement of proximity induced superconductivity in planar Germanium","ec_funded":1,"file_date_updated":"2020-12-02T10:42:31Z"}]