TY - JOUR AU - Haller, R. AU - Osterwalder, M. AU - Fülöp, Gergő AU - Ridderbos, J. AU - Jung, M. AU - Schönenberger, C. TI - ac Josephson effect in a gate-tunable Cd 3 As 2 nanowire superconducting weak link JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 108 PY - 2023 IS - 9 SN - 2469-9950 DO - 10.1103/PhysRevB.108.094514 UR - https://m2.mtmt.hu/api/publication/34147324 ID - 34147324 N1 - Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH-4056, Switzerland Department of Physics, Institute of Physics, Budapest University of Technology and Economics, MTA-BME Nanoelectronics Momentum Research Group, Műegyetem rakpart 3, Budapest, H-1111, Hungary MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, 7500 AE, Netherlands DGIST Research Institute, DGIST, Daegu, 42988, South Korea Swiss Nanoscience Institute, University of Basel, Klingelbergstrasse 82, Basel, CH-4056, Switzerland Export Date: 6 October 2023 Correspondence Address: Haller, R.; Department of Physics, Klingelbergstrasse 82, Switzerland; email: roy.haller@unibas.ch LA - English DB - MTMT ER - TY - JOUR AU - Elalaily, Tosson AU - Berke, Martin AU - Kedves, Máté AU - Fülöp, Gergő AU - Scherübl, Zoltán AU - Kanne, Thomas AU - Nygård, Jesper AU - Makk, Péter AU - Csonka, Szabolcs TI - Signatures of Gate-Driven Out-of-Equilibrium Superconductivity in Ta/InAs Nanowires JF - ACS NANO J2 - ACS NANO VL - 17 PY - 2023 IS - 6 SP - 5528 EP - 5535 PG - 8 SN - 1936-0851 DO - 10.1021/acsnano.2c10877 UR - https://m2.mtmt.hu/api/publication/33733401 ID - 33733401 LA - English DB - MTMT ER - TY - JOUR AU - Kürtössy, Olivér AU - Scherübl, Zoltán AU - Fülöp, Gergő AU - Lukács, István Endre AU - Kanne, Thomas AU - Nygard, Jesper AU - Makk, Péter AU - Csonka, Szabolcs TI - Parallel InAs nanowires for Cooper pair splitters with Coulomb repulsion JF - NPJ QUANTUM MATERIALS J2 - NPJ QUANTUM MATER VL - 7 PY - 2022 IS - 1 PG - 6 SN - 2397-4648 DO - 10.1038/s41535-022-00497-9 UR - https://m2.mtmt.hu/api/publication/33096845 ID - 33096845 AB - Hybrid nanostructures consisting of two parallel InAs nanowires connected by an epitaxially grown superconductor (SC) shell recently became available. Due to the defect-free SC-semiconductor interface and the two quasi-one-dimensional channels being close by, these platforms can be utilized to spatially separate entangled pairs of electrons by using quantum dots (QD) in the so-called Cooper pair splitting (CPS) process. The minimized distance between the QDs overcomes the limitations of single-wire-based geometries and can boost the splitting efficiency. Here we investigate CPS in such a device where strong inter-dot Coulomb repulsion is also present and studied thoroughly. We analyze theoretically the slight reduction of the CPS efficiency imposed by the Coulomb interaction and compare it to the experiments. Despite the competition between crossed Andreev reflection (CAR) and inter-wire capacitance, a significant CPS signal is observed indicating the dominance of the superconducting coupling. Our results demonstrate that the application of parallel InAs nanowires with epitaxial SC is a promising route for the realization of parafermionic states relying on enhanced CAR between the wires. LA - English DB - MTMT ER - TY - JOUR AU - Scherübl, Zoltán AU - Fülöp, Gergő AU - Gramich, Jörg AU - Pályi, András AU - Schönenberger, Christian AU - Nygard, Jesper AU - Csonka, Szabolcs TI - From Cooper pair splitting to nonlocal spectroscopy of a Shiba state JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 4 PY - 2022 IS - 2 PG - 11 SN - 2643-1564 DO - 10.1103/PhysRevResearch.4.023143 UR - https://m2.mtmt.hu/api/publication/32916679 ID - 32916679 N1 - Funding Agency and Grant Number: Ministry of Innovation and Technology; National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary; Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]; NKFIH fund TKP2020 IES; OTKA [132146, K138433]; QuantERA SuperTop [127900]; AndQC FetOpen project; SuperGate FetOpen project; Nanocohybri COST Action [CA16218]; Danish National Research Foundation; Swiss National Science Foundation [192027]; NCCR QSIT; NCCR SPIN; QuantERA project SuperTop; European Union [828948]; New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund [UNKP-21-5] Funding text: We acknowledge Morten H. Madsen for MBE growth, Titusz Feher, Peter Makk, C.at.alin Pascu Moca, Pascal Simon, Attila Virosztek, and Gergely Zarand for useful discussions. We also acknowledge SNI NanoImaging Lab for FIB cutting, and M. G. Beckerne, F. Fulop, and M. Hajdu for their technical support. This research was supported by the Ministry of Innovation and Technology and the National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary and by the Quantum Technology National Excellence Program (Project Nr. 2017-1.2.1-NKP-2017-00001), by the NKFIH fund TKP2020 IES (Grant No. BME-IE-NAT), and by the OTKA Grant No. 132146 and K138433, by QuantERA SuperTop project 127900, by AndQC FetOpen project, by SuperGate FetOpen project, by Nanocohybri COST Action CA16218, and by the Danish National Research Foundation. C.S. acknowledges support from the Swiss National Science Foundation through Grants No. 192027, the NCCR QSIT, NCCR SPIN, and the QuantERA project SuperTop. C.S. further acknowledges support from the European Union's Horizon 2020 research and innovation programme through Grant Agreement No. 828948, Project AndQC. G.F. acknowledges Bolyai Janos Scholarship and was supported by the UNKP-21-5 New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund. AB - Cooper pair splitting (CPS) is a way to create spatially separated, entangled electron pairs. To this day, CPS is often identified in experiments as a spatial current correlation. However, such correlations can arise even in the absence of CPS, when a quantum dot is strongly coupled to the superconductor, and a subgap Shiba state is formed. Here, we present a detailed experimental characterization of those spatial current correlations, as the tunnel barrier strength between the quantum dot and the neighboring normal electrode is tuned. The correlation of the nonlocal signal and the barrier strength reveals a competition between CPS and the nonlocal probing of the Shiba state. We describe our experiment with a simple transport model and obtain the tunnel couplings of our device by fitting the model's prediction to the measured conductance correlation curve. Furthermore, we use our theory to extract the contribution of CPS to the nonlocal signal. LA - English DB - MTMT ER - TY - JOUR AU - Haller, Roy AU - Fülöp, Gergő AU - Indolese, David AU - Ridderbos, Joost AU - Kraft, Rainer AU - Cheung, Luk Yi AU - Ungerer, Jann Hinnerk AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Beckmann, Detlef TI - Phase-dependent microwave response of a graphene Josephson junction JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 4 PY - 2022 IS - 1 SN - 2643-1564 DO - 10.1103/PhysRevResearch.4.013198 UR - https://m2.mtmt.hu/api/publication/32747661 ID - 32747661 N1 - Funding Agency and Grant Number: Swiss National Science FoundationSwiss National Science Foundation (SNSF)European Commission [172638, 192027]; National Centre of Competence in Research Quantum Science and Technology (QSIT); QuantEra project SuperTop; Janos Bolyai Research Scholarship of the Hungarian Academy of SciencesHungarian Academy of Sciences; National Research Development and Innovation Office (NK-FIH) through the OTKAOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [FK 132146, NN127903]; National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]; Quantum Information National Laboratory of Hungary; New National Excellence Program [UNKP-20-5]; European Unions Horizon 2020 research and innovation programme, European Research Council (ERC) [787414]; European Unions Horizon 2020 research and innovation programme [828948]; Helmholtz society through program STN; DFGGerman Research Foundation (DFG)European Commission [DA 1280/3-1, DA 1280/7-1, BE 4422/4-1]; Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]; JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) [JP20H00354]; CREST, JSTJapan Science & Technology Agency (JST)Core Research for Evolutional Science and Technology (CREST) [JPMJCR15F3]; Academy of Finland ProjectAcademy of Finland [317118]; European UnionEuropean Commission [800923] Funding text: We thank S. Dehm for technical support in the nanofabrication facility at KIT. We are grateful for discussions about general properties of 2D Josephson junctions with A. Kononov and P. Karnatak. This research was supported by the Swiss National Science Foundation through (a) Grants No. 172638 and No. 192027, (b) the National Centre of Competence in Research Quantum Science and Technology (QSIT), and (c) the QuantEra project SuperTop; the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, the National Research Development and Innovation Office (NK-FIH) through the OTKA Grants No. FK 132146 and No. NN127903 (FlagERA Topograph), and the National Research, Development and Innovation Fund of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), the Quantum Information National Laboratory of Hungary and the UNKP-20-5 New National Excellence Program. We further acknowledge funding from the European Unions Horizon 2020 research and innovation programme, specifically (a) from the European Research Council (ERC) Grant Agreement No. 787414, ERC-Adv TopSupra, and (b) Grant Agreement No. 828948, FET-open project AndQC. This work was partly supported by Helmholtz society through program STN and the DFG via the projects DA 1280/3-1, DA 1280/7-1, and BE 4422/4-1. K. Watanabe and T. Taniguchi acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant No. JPMXP0112101001, JSPS KAKENHI Grant No. JP20H00354 and the CREST(JPMJCR15F3), JST and P. Virtanen acknowledges support from Academy of Finland Project 317118 and the European Union's Horizon 2020 Research and Innovation Framework Programme under Grant No. 800923 (SUPERTED). 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