[{"date_published":"2023-06-13T00:00:00Z","acknowledgement":"The authors acknowledge Alexander Brinkmann, Alessandro Crippa, Andrew Higginbotham, Andrea Iorio, Giordano\r\nScappucci and Christian Schonenberger for helpful discussions. We thank Marcel Verheijen for the support in the\r\nTEM analysis. This research and related results were made\r\npossible with the support of the NOMIS Foundation. It was\r\nsupported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the\r\nnanofabrication facility, the European Union’s Horizon 2020\r\nresearch and innovation programme under Grant Agreement\r\nNo 862046, the HORIZON-RIA 101069515 project and the\r\nFWF Projects #P-32235, #P-36507 and #F-8606. R.S.S.\r\nacknowledges Spanish CM “Talento Program” Project No.\r\n2022-T1/IND-24070.","ec_funded":1,"project":[{"name":"TOPOLOGICALLY PROTECTED AND SCALABLE QUANTUM BITS","grant_number":"862046","call_identifier":"H2020","_id":"237E5020-32DE-11EA-91FC-C7463DDC885E"},{"_id":"237B3DA4-32DE-11EA-91FC-C7463DDC885E","call_identifier":"FWF","grant_number":"P32235","name":"Towards scalable hut wire quantum devices"},{"name":"Merging spin and superconducting qubits in planar Ge","grant_number":"P36507","_id":"bd8bd29e-d553-11ed-ba76-f0070d4b237a"},{"_id":"34a66131-11ca-11ed-8bc3-a31681c6b03e","grant_number":"F8606","name":"Conventional and unconventional topological superconductors"},{"_id":"bd5b4ec5-d553-11ed-ba76-a6eedb083344","name":"Protected states of quantum matter"}],"status":"public","publication":"arXiv","keyword":["Mesoscale and Nanoscale Physics"],"external_id":{"arxiv":["2306.07109"]},"related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"13286"}]},"year":"2023","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2306.07109"}],"ddc":["530"],"type":"preprint","date_updated":"2024-02-07T07:52:32Z","_id":"13312","doi":"10.48550/arXiv.2306.07109","article_processing_charge":"No","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","citation":{"ista":"Valentini M, Sagi O, Baghumyan L, Gijsel T de, Jung J, Calcaterra S, Ballabio A, Servin JA, Aggarwal K, Janik M, Adletzberger T, Souto RS, Leijnse M, Danon J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. arXiv, 2306.07109.","chicago":"Valentini, Marco, Oliver Sagi, Levon Baghumyan, Thijs de Gijsel, Jason Jung, Stefano Calcaterra, Andrea Ballabio, et al. “Radio Frequency Driven Superconducting Diode and Parity Conserving  Cooper Pair Transport in a Two-Dimensional Germanium Hole Gas.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.2306.07109\">https://doi.org/10.48550/arXiv.2306.07109</a>.","mla":"Valentini, Marco, et al. “Radio Frequency Driven Superconducting Diode and Parity Conserving  Cooper Pair Transport in a Two-Dimensional Germanium Hole Gas.” <i>ArXiv</i>, 2306.07109, doi:<a href=\"https://doi.org/10.48550/arXiv.2306.07109\">10.48550/arXiv.2306.07109</a>.","apa":"Valentini, M., Sagi, O., Baghumyan, L., Gijsel, T. de, Jung, J., Calcaterra, S., … Katsaros, G. (n.d.). Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.2306.07109\">https://doi.org/10.48550/arXiv.2306.07109</a>","ama":"Valentini M, Sagi O, Baghumyan L, et al. Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.2306.07109\">10.48550/arXiv.2306.07109</a>","short":"M. Valentini, O. Sagi, L. Baghumyan, T. de Gijsel, J. Jung, S. Calcaterra, A. Ballabio, J.A. Servin, K. Aggarwal, M. Janik, T. Adletzberger, R.S. Souto, M. Leijnse, J. Danon, C. Schrade, E. Bakkers, D. Chrastina, G. Isella, G. Katsaros, ArXiv (n.d.).","ieee":"M. Valentini <i>et al.</i>, “Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas,” <i>arXiv</i>. ."},"language":[{"iso":"eng"}],"oa":1,"article_number":"2306.07109","department":[{"_id":"GeKa"},{"_id":"M-Shop"}],"month":"06","arxiv":1,"publication_status":"submitted","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)"},"license":"https://creativecommons.org/licenses/by/4.0/","abstract":[{"text":"Superconductor/semiconductor hybrid devices have attracted increasing\r\ninterest in the past years. Superconducting electronics aims to complement\r\nsemiconductor technology, while hybrid architectures are at the forefront of\r\nnew ideas such as topological superconductivity and protected qubits. In this\r\nwork, we engineer the induced superconductivity in two-dimensional germanium\r\nhole gas by varying the distance between the quantum well and the aluminum. We\r\ndemonstrate a hard superconducting gap and realize an electrically and flux\r\ntunable superconducting diode using a superconducting quantum interference\r\ndevice (SQUID). This allows to tune the current phase relation (CPR), to a\r\nregime where single Cooper pair tunneling is suppressed, creating a $ \\sin\r\n\\left( 2 \\varphi \\right)$ CPR. Shapiro experiments complement this\r\ninterpretation and the microwave drive allows to create a diode with $ \\approx\r\n100 \\%$ efficiency. The reported results open up the path towards monolithic\r\nintegration of spin qubit devices, microwave resonators and (protected)\r\nsuperconducting qubits on a silicon technology compatible platform.","lang":"eng"}],"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"date_created":"2023-07-26T11:17:20Z","oa_version":"Preprint","title":"Radio frequency driven superconducting diode and parity conserving  Cooper pair transport in a two-dimensional germanium hole gas","author":[{"first_name":"Marco","last_name":"Valentini","id":"C0BB2FAC-D767-11E9-B658-BC13E6697425","full_name":"Valentini, Marco"},{"id":"71616374-A8E9-11E9-A7CA-09ECE5697425","full_name":"Sagi, Oliver","last_name":"Sagi","first_name":"Oliver"},{"first_name":"Levon","full_name":"Baghumyan, Levon","last_name":"Baghumyan"},{"first_name":"Thijs de","last_name":"Gijsel","full_name":"Gijsel, Thijs de"},{"full_name":"Jung, Jason","id":"4C9ACE7A-F248-11E8-B48F-1D18A9856A87","last_name":"Jung","first_name":"Jason"},{"first_name":"Stefano","last_name":"Calcaterra","full_name":"Calcaterra, Stefano"},{"last_name":"Ballabio","full_name":"Ballabio, Andrea","first_name":"Andrea"},{"full_name":"Servin, Juan Aguilera","last_name":"Servin","first_name":"Juan Aguilera"},{"first_name":"Kushagra","orcid":"0000-0001-9985-9293","id":"b22ab905-3539-11eb-84c3-fc159dcd79cb","full_name":"Aggarwal, Kushagra","last_name":"Aggarwal"},{"full_name":"Janik, Marian","id":"396A1950-F248-11E8-B48F-1D18A9856A87","last_name":"Janik","first_name":"Marian"},{"first_name":"Thomas","full_name":"Adletzberger, Thomas","id":"38756BB2-F248-11E8-B48F-1D18A9856A87","last_name":"Adletzberger"},{"first_name":"Rubén Seoane","last_name":"Souto","full_name":"Souto, Rubén Seoane"},{"last_name":"Leijnse","full_name":"Leijnse, Martin","first_name":"Martin"},{"full_name":"Danon, Jeroen","last_name":"Danon","first_name":"Jeroen"},{"last_name":"Schrade","full_name":"Schrade, Constantin","first_name":"Constantin"},{"last_name":"Bakkers","full_name":"Bakkers, Erik","first_name":"Erik"},{"last_name":"Chrastina","full_name":"Chrastina, Daniel","first_name":"Daniel"},{"first_name":"Giovanni","full_name":"Isella, Giovanni","last_name":"Isella"},{"full_name":"Katsaros, Georgios","id":"38DB5788-F248-11E8-B48F-1D18A9856A87","last_name":"Katsaros","first_name":"Georgios","orcid":"0000-0001-8342-202X"}],"day":"13"},{"department":[{"_id":"MaSe"},{"_id":"MiLe"}],"arxiv":1,"month":"09","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","citation":{"ista":"Zhou H, Xie T, Ghazaryan A, Holder T, Ehrets JR, Spanton EM, Taniguchi T, Watanabe K, Berg E, Serbyn M, Young AF. 2021. Half and quarter metals in rhombohedral trilayer graphene. Nature.","chicago":"Zhou, Haoxin, Tian Xie, Areg Ghazaryan, Tobias Holder, James R. Ehrets, Eric M. Spanton, Takashi Taniguchi, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” <i>Nature</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1038/s41586-021-03938-w\">https://doi.org/10.1038/s41586-021-03938-w</a>.","apa":"Zhou, H., Xie, T., Ghazaryan, A., Holder, T., Ehrets, J. R., Spanton, E. M., … Young, A. F. (2021). Half and quarter metals in rhombohedral trilayer graphene. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-021-03938-w\">https://doi.org/10.1038/s41586-021-03938-w</a>","mla":"Zhou, Haoxin, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” <i>Nature</i>, Springer Nature, 2021, doi:<a href=\"https://doi.org/10.1038/s41586-021-03938-w\">10.1038/s41586-021-03938-w</a>.","ama":"Zhou H, Xie T, Ghazaryan A, et al. Half and quarter metals in rhombohedral trilayer graphene. <i>Nature</i>. 2021. doi:<a href=\"https://doi.org/10.1038/s41586-021-03938-w\">10.1038/s41586-021-03938-w</a>","ieee":"H. Zhou <i>et al.</i>, “Half and quarter metals in rhombohedral trilayer graphene,” <i>Nature</i>. Springer Nature, 2021.","short":"H. Zhou, T. Xie, A. Ghazaryan, T. Holder, J.R. Ehrets, E.M. Spanton, T. Taniguchi, K. Watanabe, E. Berg, M. Serbyn, A.F. Young, Nature (2021)."},"language":[{"iso":"eng"}],"oa":1,"date_created":"2021-09-19T22:01:25Z","article_type":"original","title":"Half and quarter metals in rhombohedral trilayer graphene","oa_version":"Preprint","scopus_import":"1","day":"01","author":[{"first_name":"Haoxin","last_name":"Zhou","full_name":"Zhou, Haoxin"},{"full_name":"Xie, Tian","last_name":"Xie","first_name":"Tian"},{"first_name":"Areg","orcid":"0000-0001-9666-3543","full_name":"Ghazaryan, Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan"},{"first_name":"Tobias","full_name":"Holder, Tobias","last_name":"Holder"},{"last_name":"Ehrets","full_name":"Ehrets, James R.","first_name":"James R."},{"full_name":"Spanton, Eric M.","last_name":"Spanton","first_name":"Eric M."},{"full_name":"Taniguchi, Takashi","last_name":"Taniguchi","first_name":"Takashi"},{"first_name":"Kenji","full_name":"Watanabe, Kenji","last_name":"Watanabe"},{"full_name":"Berg, Erez","last_name":"Berg","first_name":"Erez"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827"},{"last_name":"Young","full_name":"Young, Andrea F.","first_name":"Andrea F."}],"publication_status":"published","publication_identifier":{"eissn":["1476-4687"],"issn":["0028-0836"]},"abstract":[{"text":"Ferromagnetism is most common in transition metal compounds but may also arise in low-density two-dimensional electron systems, with signatures observed in silicon, III-V semiconductor systems, and graphene moiré heterostructures. Here we show that gate-tuned van Hove singularities in rhombohedral trilayer graphene drive the spontaneous ferromagnetic polarization of the electron system into one or more spin- and valley flavors. Using capacitance measurements on graphite-gated van der Waals heterostructures, we find a cascade of density- and electronic displacement field tuned phase transitions marked by negative electronic compressibility. The transitions define the boundaries between phases where quantum oscillations have either four-fold, two-fold, or one-fold degeneracy, associated with a spin and valley degenerate normal metal, spin-polarized `half-metal', and spin and valley polarized `quarter metal', respectively. For electron doping, the salient features are well captured by a phenomenological Stoner model with a valley-anisotropic Hund's coupling, likely arising from interactions at the lattice scale. For hole filling, we observe a richer phase diagram featuring a delicate interplay of broken symmetries and transitions in the Fermi surface topology. Finally, by rotational alignment of a hexagonal boron nitride substrate to induce a moiré superlattice, we find that the superlattice perturbs the preexisting isospin order only weakly, leaving the basic phase diagram intact while catalyzing the formation of topologically nontrivial gapped states whenever itinerant half- or quarter metal states occur at half- or quarter superlattice band filling. Our results show that rhombohedral trilayer graphene is an ideal platform for well-controlled tests of many-body theory and reveal magnetism in moiré materials to be fundamentally itinerant in nature.","lang":"eng"}],"keyword":["condensed matter - mesoscale and nanoscale physics","condensed matter - strongly correlated electrons","multidisciplinary"],"related_material":{"link":[{"relation":"erratum","url":"https://doi.org/10.1038/s41586-021-04181-z"}]},"external_id":{"isi":["000706977400002"],"arxiv":["2104.00653"]},"isi":1,"year":"2021","acknowledgement":"The authors acknowledge discussions with A. Macdonald, L. Fu, F. Wang and M. Zaletel. AFY acknowledges support of the National Science Foundation under DMR1654186, and the Gordon and Betty Moore Foundation under award GBMF9471. The authors acknowledge the use of the research facilities within the California NanoSystems Institute, supported by the University of California, Santa Barbara and the University of California, Office of the President.\r\nK.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001 and JSPS KAKENHI, Grant Number JP20H00354. EB and TH were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799). A.G. acknowledges support by the European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement\r\nNo. 754411.\r\n","date_published":"2021-09-01T00:00:00Z","ec_funded":1,"status":"public","publication":"Nature","project":[{"grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425"}],"type":"journal_article","_id":"10025","date_updated":"2023-08-14T07:04:06Z","publisher":"Springer Nature","article_processing_charge":"No","doi":"10.1038/s41586-021-03938-w","quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2104.00653"}]},{"department":[{"_id":"JoFi"},{"_id":"NanoFab"},{"_id":"M-Shop"}],"file":[{"file_id":"10641","date_updated":"2022-01-18T11:29:33Z","creator":"cchlebak","file_size":4247422,"date_created":"2022-01-18T11:29:33Z","checksum":"36eb41ea43d8ca22b0efab12419e4eb2","relation":"main_file","content_type":"application/pdf","access_level":"open_access","file_name":"2021_PRXQuantum_Peruzzo.pdf","success":1}],"arxiv":1,"month":"11","issue":"4","citation":{"ama":"Peruzzo M, Hassani F, Szep G, et al. Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction. <i>PRX Quantum</i>. 2021;2(4):040341. doi:<a href=\"https://doi.org/10.1103/PRXQuantum.2.040341\">10.1103/PRXQuantum.2.040341</a>","short":"M. Peruzzo, F. Hassani, G. Szep, A. Trioni, E. Redchenko, M. Zemlicka, J.M. Fink, PRX Quantum 2 (2021) 040341.","ieee":"M. Peruzzo <i>et al.</i>, “Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction,” <i>PRX Quantum</i>, vol. 2, no. 4. American Physical Society, p. 040341, 2021.","ista":"Peruzzo M, Hassani F, Szep G, Trioni A, Redchenko E, Zemlicka M, Fink JM. 2021. Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction. PRX Quantum. 2(4), 040341.","chicago":"Peruzzo, Matilda, Farid Hassani, Gregory Szep, Andrea Trioni, Elena Redchenko, Martin Zemlicka, and Johannes M Fink. “Geometric Superinductance Qubits: Controlling Phase Delocalization across a Single Josephson Junction.” <i>PRX Quantum</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/PRXQuantum.2.040341\">https://doi.org/10.1103/PRXQuantum.2.040341</a>.","mla":"Peruzzo, Matilda, et al. “Geometric Superinductance Qubits: Controlling Phase Delocalization across a Single Josephson Junction.” <i>PRX Quantum</i>, vol. 2, no. 4, American Physical Society, 2021, p. 040341, doi:<a href=\"https://doi.org/10.1103/PRXQuantum.2.040341\">10.1103/PRXQuantum.2.040341</a>.","apa":"Peruzzo, M., Hassani, F., Szep, G., Trioni, A., Redchenko, E., Zemlicka, M., &#38; Fink, J. M. (2021). Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PRXQuantum.2.040341\">https://doi.org/10.1103/PRXQuantum.2.040341</a>"},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","oa":1,"language":[{"iso":"eng"}],"volume":2,"article_type":"original","date_created":"2021-08-17T08:14:18Z","author":[{"first_name":"Matilda","orcid":"0000-0002-3415-4628","full_name":"Peruzzo, Matilda","id":"3F920B30-F248-11E8-B48F-1D18A9856A87","last_name":"Peruzzo"},{"first_name":"Farid","orcid":"0000-0001-6937-5773","last_name":"Hassani","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","full_name":"Hassani, Farid"},{"first_name":"Gregory","full_name":"Szep, Gregory","last_name":"Szep"},{"full_name":"Trioni, Andrea","id":"42F71B44-F248-11E8-B48F-1D18A9856A87","last_name":"Trioni","first_name":"Andrea"},{"first_name":"Elena","full_name":"Redchenko, Elena","id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87","last_name":"Redchenko"},{"id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","full_name":"Zemlicka, Martin","last_name":"Zemlicka","first_name":"Martin"},{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X","first_name":"Johannes M"}],"day":"24","scopus_import":"1","title":"Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction","oa_version":"Published Version","publication_status":"published","publication_identifier":{"eissn":["2691-3399"]},"file_date_updated":"2022-01-18T11:29:33Z","has_accepted_license":"1","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)"},"intvolume":"         2","abstract":[{"text":"There are two elementary superconducting qubit types that derive directly from the quantum harmonic oscillator. In one, the inductor is replaced by a nonlinear Josephson junction to realize the widely used charge qubits with a compact phase variable and a discrete charge wave function. In the other, the junction is added in parallel, which gives rise to an extended phase variable, continuous wave functions, and a rich energy-level structure due to the loop topology. While the corresponding rf superconducting quantum interference device Hamiltonian was introduced as a quadratic quasi-one-dimensional potential approximation to describe the fluxonium qubit implemented with long Josephson-junction arrays, in this work we implement it directly using a linear superinductor formed by a single uninterrupted aluminum wire. We present a large variety of qubits, all stemming from the same circuit but with drastically different characteristic energy scales. This includes flux and fluxonium qubits but also the recently introduced quasicharge qubit with strongly enhanced zero-point phase fluctuations and a heavily suppressed flux dispersion. The use of a geometric inductor results in high reproducibility of the inductive energy as guaranteed by top-down lithography—a key ingredient for intrinsically protected superconducting qubits.","lang":"eng"}],"acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"keyword":["quantum physics","mesoscale and nanoscale physics"],"isi":1,"year":"2021","external_id":{"isi":["000723015100001"],"arxiv":["2106.05882"]},"related_material":{"record":[{"id":"13057","relation":"research_data","status":"public"},{"id":"9920","relation":"dissertation_contains","status":"public"}]},"ec_funded":1,"acknowledgement":"We thank W. Hughes for analytic and numerical modeling during the early stages of this work, J. Koch for discussions and support with the scqubits package, R. Sett, P. Zielinski, and L. Drmic for software development, and G. Katsaros for equipment support, as well as the MIBA workshop and the Institute of Science and Technology Austria nanofabrication facility. We thank I. Pop, S. Deleglise, and E. Flurin for discussions. This work was supported by a NOMIS Foundation research grant, the Austrian Science Fund (FWF) through BeyondC (F7105), and IST Austria. M.P. is the recipient of a Pöttinger scholarship at IST Austria. E.R. is the recipient of a DOC fellowship of the Austrian Academy of Sciences at IST Austria.","date_published":"2021-11-24T00:00:00Z","project":[{"_id":"26927A52-B435-11E9-9278-68D0E5697425","call_identifier":"FWF","name":"Integrating superconducting quantum circuits","grant_number":"F07105"},{"call_identifier":"H2020","name":"International IST Doctoral Program","grant_number":"665385","_id":"2564DBCA-B435-11E9-9278-68D0E5697425"},{"name":"Hybrid Semiconductor - Superconductor Quantum Devices","_id":"2622978C-B435-11E9-9278-68D0E5697425"}],"status":"public","publication":"PRX Quantum","date_updated":"2023-09-07T13:31:22Z","_id":"9928","type":"journal_article","doi":"10.1103/PRXQuantum.2.040341","article_processing_charge":"No","publisher":"American Physical Society","quality_controlled":"1","page":"040341","ddc":["530"]}]