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 - Kedves, Máté AU - Szentpéteri, Bálint AU - Márffy, Albin Máté AU - Tóvári, Endre AU - Papadopoulos, Nikos AU - Rout, Prasanna K. AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Goswami, Srijit AU - Csonka, Szabolcs AU - Makk, Péter TI - Stabilizing the Inverted Phase of a WSe 2 /BLG/WSe 2 Heterostructure via Hydrostatic Pressure JF - NANO LETTERS J2 - NANO LETT VL - 23 PY - 2023 IS - 20 SP - 9508 EP - 9514 PG - 7 SN - 1530-6984 DO - 10.1021/acs.nanolett.3c03029 UR - https://m2.mtmt.hu/api/publication/34207534 ID - 34207534 LA - English DB - MTMT ER - TY - GEN AU - Kovács-Krausz, Zoltán AU - Nagy, Dániel AU - Márffy, Albin Máté AU - Karpiak, Bogdan AU - Tajkov, Zoltán AU - Oroszlány, László AU - Koltai, János AU - Nemes Incze, Péter AU - Dash, Saroj P AU - Makk, Péter AU - Csonka, Szabolcs AU - Tóvári, Endre TI - Signature of pressure-induced topological phase transition in ZrTe5 PY - 2023 UR - https://m2.mtmt.hu/api/publication/34719870 ID - 34719870 AB - The layered van der Waals material ZrTe5 is known as a candidate topological insulator (TI), however its topological phase and the relation with other properties such as an apparent Dirac semimetallic state is still a subject of debate. We employ a semiclassical multicarrier transport (MCT) model to analyze the magnetotransport of ZrTe5 nanodevices at hydrostatic pressures up to 2 GPa. The temperature dependence of the MCT results between 10 and 300 K is assessed in the context of thermal activation, and we obtain the positions of conduction and valence band edges in the vicinity of the chemical potential. We find evidence of the closing and subsequent re-opening of the band gap with increasing pressure, which is consistent with a phase transition from weak to strong TI. This matches expectations from ab initio band structure calculations, as well as previous observations that CVT-grown ZrTe5 is in a weak TI phase in ambient conditions. LA - English DB - MTMT ER - TY - JOUR AU - Kovács-Krausz, Zoltán AU - Tóvári, Endre AU - Nagy, Dániel AU - Márffy, Albin Máté AU - Karpiak, Bogdan AU - Tajkov, Zoltán AU - Oroszlány, László AU - Koltai, János AU - Nemes Incze, Péter AU - Dash, Saroj P. AU - Makk, Péter AU - Csonka, Szabolcs TI - Revealing the band structure of ZrTe5 using multicarrier transport JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 107 PY - 2023 IS - 7 PG - 10 SN - 2469-9950 DO - 10.1103/PhysRevB.107.075152 UR - https://m2.mtmt.hu/api/publication/33673970 ID - 33673970 LA - English DB - MTMT ER - TY - JOUR AU - Ruf, L. AU - Elalaily, Tosson AU - Puglia, C. AU - Ivanov, Yu.P. AU - Joint, F. AU - Berke, Martin AU - Iorio, A. AU - Makk, Péter AU - De, Simoni G. AU - Gasparinetti, S. AU - Divitini, G. AU - Csonka, Szabolcs AU - Giazotto, F. AU - Scheer, E. AU - Di Bernardo, A. TI - Effects of fabrication routes and material parameters on the control of superconducting currents by gate voltage JF - APL MATERIALS J2 - APL MATER VL - 11 PY - 2023 IS - 9 PG - 7 SN - 2166-532X DO - 10.1063/5.0159750 UR - https://m2.mtmt.hu/api/publication/34192924 ID - 34192924 LA - English DB - MTMT ER - TY - JOUR AU - Kanne, Thomas AU - Olsteins, Dags AU - Marnauza, Mikelis AU - Vekris, Alexandros AU - Estrada Saldaña, Juan Carlos AU - Loric̀, Sara AU - Schlosser, Rasmus D. AU - Ross, Daniel AU - Csonka, Szabolcs AU - Grove-Rasmussen, Kasper AU - Nygård, Jesper TI - Double Nanowires for Hybrid Quantum Devices JF - ADVANCED FUNCTIONAL MATERIALS J2 - ADV FUNCT MATER VL - 32 PY - 2022 IS - 9 PG - 9 SN - 1616-301X DO - 10.1002/adfm.202107926 UR - https://m2.mtmt.hu/api/publication/32552315 ID - 32552315 AB - Parallel 1D semiconductor channels connected by a superconducting strip constitute the core platform in several recent quantum device proposals that rely, for example, on Andreev processes or topological effects. In order to realize these proposals, the actual material systems must have high crystalline purity, and the coupling between the different elements should be controllable in terms of their interfaces and geometry. A strategy for synthesizing double InAs nanowires by the vapor-liquid-solid mechanism using III-V molecular beam epitaxy is presented. A superconducting layer is deposited onto nanowires without breaking the vacuum, ensuring pristine interfaces between the superconductor and the two semiconductor nanowires. The method allows for a high yield of merged as well as separate parallel nanowires with full or half-shell superconductor coatings. Their utility in complex quantum devices by electron transport measurements is demonstrated. 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 - Sütő, Máté AU - Prok, Tamás AU - Makk, Péter AU - Kirti, Magdhi AU - Biasiol, Giorgio AU - Csonka, Szabolcs AU - Tóvári, Endre TI - Near-surface InAs two-dimensional electron gas on a GaAs substrate: Characterization and superconducting proximity effect JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 106 PY - 2022 IS - 23 PG - 9 SN - 2469-9950 DO - 10.1103/PhysRevB.106.235404 UR - https://m2.mtmt.hu/api/publication/33293455 ID - 33293455 N1 - Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111, Hungary MTA-BME Superconducting Nanoelectronics Momentum Research Group, Muegyetem rkp. 3, Budapest, H-1111, Hungary MTA-BME Correlated Van der Waals Structures Momentum Research Group, Muegyetem rkp. 3, Budapest, H-1111, Hungary IOM CNR, Laboratorio TASC, Area Science Park Basovizza, Trieste, 34149, Italy Department of Physics, University of Trieste, Trieste, 34128, Italy Export Date: 5 April 2023 LA - English DB - MTMT ER - TY - JOUR AU - Elalaily, Tosson AU - Kürtössy, Olivér AU - Scherübl, Zoltán AU - Berke, Martin AU - Fülöp, Gergő AU - Lukács, István Endre AU - Kanne, Thomas AU - Nygård, Jesper AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Makk, Péter AU - Csonka, Szabolcs TI - Gate-Controlled Supercurrent in Epitaxial Al/InAs Nanowires JF - NANO LETTERS J2 - NANO LETT VL - 21 PY - 2021 IS - 22 SP - 9684 EP - 9690 PG - 7 SN - 1530-6984 DO - 10.1021/acs.nanolett.1c03493 UR - https://m2.mtmt.hu/api/publication/32541140 ID - 32541140 LA - English DB - MTMT ER - TY - JOUR AU - Fülöp, Bálint AU - Márffy, Albin Máté AU - Zihlmann, Simon AU - Gmitra, Martin AU - Tóvári, Endre AU - Szentpéteri, Bálint AU - Kedves, Máté AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Fabian, Jaroslav AU - Schönenberger, Christian AU - Makk, Péter AU - Csonka, Szabolcs TI - Boosting proximity spin–orbit coupling in graphene/WSe2 heterostructures via hydrostatic pressure JF - NPJ 2D MATERIALS AND APPLICATIONS J2 - NPJ 2D MATER APPL VL - 5 PY - 2021 IS - 1 PG - 6 SN - 2397-7132 DO - 10.1038/s41699-021-00262-9 UR - https://m2.mtmt.hu/api/publication/32294722 ID - 32294722 N1 - Funding Agency and Grant Number: Topograph FlagERA network [OTKA NN-127903, OTKA FK-123894, PD-134758]; Swiss Nanoscience Institute; ERC project Top-Supra [787414]; Swiss National Science FoundationSwiss National Science Foundation (SNSF)European Commission; Swiss NCCR QSIT; 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, VEKOP-2.3.3-15-2017-00015]; COST (European Cooperation in Science and Technology)European Cooperation in Science and Technology (COST); Bolyai FellowshipHungarian Academy of Sciences; Scientific Grant Agency of the Ministry of Education of the Slovak Republic [VEGA 1/0105/20]; Elemental Strategy Initiative conducted 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]; CRESTCore Research for Evolutional Science and Technology (CREST) [(JPMJCR15F3] Funding text: This work was supported by the Topograph FlagERA network (OTKA NN-127903), the OTKA FK-123894 and PD-134758 grants, the Swiss Nanoscience Institute, the ERC project Top-Supra (787414), the Swiss National Science Foundation, the Swiss NCCR QSIT, 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 VEKOP-2.3.3-15-2017-00015, by SuperTop QuantERA network, and by the FET Open AndQC network. This article is based upon work from COST Action CA16218 Nanocohybri, supported by COST (European Cooperation in Science and Technology)-. P.M. and E.T. received funding from Bolyai Fellowship. M.G. acknowledges Scientific Grant Agency of the Ministry of Education of the Slovak Republic under the contract no. VEGA 1/0105/20. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001, JSPS KAKENHI Grant Numbers JP20H00354 and the CREST(JPMJCR15F3), JST. The authors thank Andor Kormanyos, Andras Palyi, and Peter Boross for fruitful discussions and Marton Hajdu and Ferenc Fulop's team for their technical support. LA - English DB - MTMT ER - TY - JOUR AU - Fülöp, Bálint AU - Márffy, Albin Máté AU - Tóvári, Endre AU - Kedves, Máté AU - Zihlmann, Simon AU - Indolese, David AU - Kovács-Krausz, Zoltán AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Schönenberger, Christian AU - Kézsmárki, István AU - Makk, Péter AU - Csonka, Szabolcs TI - New method of transport measurements on van der Waals heterostructures under pressure JF - JOURNAL OF APPLIED PHYSICS J2 - J APPL PHYS VL - 130 PY - 2021 IS - 6 PG - 13 SN - 0021-8979 DO - 10.1063/5.0058583 UR - https://m2.mtmt.hu/api/publication/32130144 ID - 32130144 N1 - Department of Physics, Budapest University of Technology and Economics, Nanoelectronics "momentum" Research Group, Hungarian Academy of Sciences, Budafoki út 8, Budapest, 1111, Hungary Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH-4056, Switzerland Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan Experimental Physics v, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, D-86159, Germany Export Date: 18 September 2021 CODEN: JAPIA Correspondence Address: Makk, P.; Department of Physics, Budafoki út 8, Hungary; email: makk.peter@ttk.bme.hu Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Swiss Nanoscience Institute, SNI Funding details: European Research Council, ERC, 787414 Funding details: European Cooperation in Science and Technology, COST, CA16218 Funding details: Japan Society for the Promotion of Science, KAKEN, JP20H00354 Funding details: Ministry of Education, Culture, Sports, Science and Technology, Monbusho, JPMXP0112101001 Funding details: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF Funding details: Japan Science and Technology Agency, JST Funding details: Core Research for Evolutional Science and Technology, CREST, JPMJCR15F3 Funding details: Hungarian Scientific Research Fund, OTKA, FK-123894 Funding details: National Center of Competence in Research Quantum Science and Technology, NCCR QSIT Funding details: Innovációs és Technológiai Minisztérium Funding details: National Research, Development and Innovation Office Funding text 1: This work acknowledges support from the Topograph FlagERA network, the OTKA FK-123894 grants, the Swiss Nanoscience Institute (SNI), the ERC project Top-Supra (No. 787414), the Swiss National Science Foundation, and the Swiss NCCR QSIT. 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 No. 2017-1.2.1-NKP-2017-00001), by the SuperTop QuantERA network, and by the FET Open AndQC network. This article is based upon work from COST Action CA16218 Nanocohybri, supported by COST (European Cooperation in Science and Technology)—www.cost.eu. P.M. and E.T. received funding from Bolyai Fellowship. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant No. JPMXP0112101001), JSPS KAKENHI (Grant No. JP20H00354), and the CREST(No. JPMJCR15F3), JST. The authors thank Gergö Fülöp for his visual and Márton Hajdú and Ferenc Fülöp for their technical support. LA - English DB - MTMT ER - TY - JOUR AU - Kocsis, Mátyás AU - Zheliuk, Oleksandr AU - Makk, Péter AU - Tóvári, Endre AU - Kun, Péter AU - Tereshchenko, Oleg Evgenevich AU - Kokh, Konstantin Aleksandrovich AU - Taniguchi, Takashi AU - Watanabe, Kenji AU - Ye, Jianting AU - Csonka, Szabolcs TI - In situ tuning of symmetry-breaking-induced nonreciprocity in the giant-Rashba semiconductor BiTeBr JF - PHYSICAL REVIEW RESEARCH J2 - PRRESEARCH VL - 3 PY - 2021 IS - 3 PG - 11 SN - 2643-1564 DO - 10.1103/PhysRevResearch.3.033253 UR - https://m2.mtmt.hu/api/publication/32210273 ID - 32210273 LA - English DB - MTMT ER - TY - JOUR AU - Kürtössy, Olivér AU - Scherübl, Zoltán AU - Fülöp, Gergő AU - Lukács, István Endre AU - Kanne, Thomas AU - Nygård, Jesper AU - Makk, Péter AU - Csonka, Szabolcs TI - Andreev Molecule in Parallel InAs Nanowires JF - NANO LETTERS J2 - NANO LETT VL - 21 PY - 2021 IS - 19 SP - 7929 EP - 7937 PG - 9 SN - 1530-6984 DO - 10.1021/acs.nanolett.1c01956 UR - https://m2.mtmt.hu/api/publication/32242695 ID - 32242695 LA - English DB - MTMT ER - TY - JOUR AU - Szentpéteri, Bálint AU - Rickhaus, Peter AU - de Vries, Folkert K AU - Márffy, Albin Máté AU - Fülöp, Bálint AU - Tóvári, Endre AU - Watanabe, Kenji AU - Taniguchi, Takashi AU - Kormányos, Andor AU - Csonka, Szabolcs AU - Makk, Péter TI - Tailoring the Band Structure of Twisted Double Bilayer Graphene with Pressure. JF - NANO LETTERS J2 - NANO LETT VL - 21 PY - 2021 IS - 20 SP - 8777 EP - 8784 PG - 8 SN - 1530-6984 DO - 10.1021/acs.nanolett.1c03066 UR - https://m2.mtmt.hu/api/publication/32462636 ID - 32462636 N1 - Department of Physics, Budapest University of Technology and Economics, Nanoelectronics Momentum Research Group, Hungarian Academy of Sciences, Budafoki ut 8, Budapest, 1111, Hungary Department of Physics, Budapest University of Technology and Economics, Correlated Van der Waals Structures Momentum Research Group, Hungarian Academy of Sciences, Budafoki ut 8, Budapest, 1111, Hungary Solid State Physics Laboratory, ETH Zürich, Zürich, CH-8093, Switzerland Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány P. s. 1/A, Budapest, 1117, Hungary Export Date: 7 March 2022 CODEN: NALEF Correspondence Address: Csonka, S.; Department of Physics, Budafoki ut 8, Hungary; email: Funding details: Innovációs és Technológiai Minisztérium Funding details: National Research, Development and Innovation Office, 2017-1.2.1-NKP-2017-00001 Funding text 1: The authors thank Prof. E. Tutuc, K. Ensslin, and T. Ihn for useful discussions, and Márton Hajdú, Ferenc Fülöp, and Gergö Fülöp for their technical support. We thank Gergö Fülöp for helping in creating the device sketch. This work acknowledges support from the Topograph FlagERA network, Grant OTKA FK-123894 and Grant OTKA PD-134758. 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 2017-1.2.1-NKP-2017-00001), by SuperTop QuantERA network, and by the FET Open AndQC network and Nanocohybri COST network. P.M., E.T., and A.K. received funding from the Hungarian Academy of Sciences through the Bolyai Fellowship. A.K. acknowledges the support from the Hungarian Scientific Research Fund (OTKA) Grant K134437 and from the ELTE Institutional Excellence Program (Grant TKP2020-IKA-05). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant JPMXP0112101001) and JSPS KAKENHI (Grants 19H05790 and JP20H00354). We acknowledge support from the Graphene Flagship and from the European Union’s Horizon 2020 research and innovation program under Grant Agreement 862660/QUANTUM E LEAPS and the Swiss National Science Foundation via NCCR Quantum Science and Technology. Low T infrastructure was provided by VEKOP-2.3.3-15-2017-00015. AB - Twisted two-dimensional structures open new possibilities in band structure engineering. At magic twist angles, flat bands emerge, which gave a new drive to the field of strongly correlated physics. In twisted double bilayer graphene dual gating allows changing of the Fermi level and hence the electron density and also allows tuning of the interlayer potential, giving further control over band gaps. Here, we demonstrate that by application of hydrostatic pressure, an additional control of the band structure becomes possible due to the change of tunnel couplings between the layers. We find that the flat bands and the gaps separating them can be drastically changed by pressures up to 2 GPa, in good agreement with our theoretical simulations. Furthermore, our measurements suggest that in finite magnetic field due to pressure a topologically nontrivial band gap opens at the charge neutrality point at zero displacement field. LA - English DB - MTMT ER - TY - JOUR AU - Tulewicz, P. AU - Wrześniewski, K. AU - Csonka, Szabolcs AU - Weymann, I. TI - Large Voltage-Tunable Spin Valve Based on a Double Quantum Dot JF - PHYSICAL REVIEW APPLIED J2 - PHYS REV APPL VL - 16 PY - 2021 IS - 1 PG - 14 SN - 2331-7019 DO - 10.1103/PhysRevApplied.16.014029 UR - https://m2.mtmt.hu/api/publication/32238958 ID - 32238958 N1 - Funding text 1: This work was supported by the Polish National Science Center from funds awarded through Decision No. 2017/27/B/ST3/00621. S.C. acknowledges funding from the Topologically protected states in double nanowire superconductor hybrids (SuperTop) European Research Area Network (ERA-NET) Cofund Programme in the field of Quantum Technologies (QT) network, the Ministry of Innovation and Technology, the National Research, Development, and Innovation Office (NKFIH) within the Quantum Information National Laboratory of Hungary, and the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-122017-00001). AB - We study the spin-dependent transport properties of a spin valve based on a double quantum dot. Each quantum dot is assumed to be strongly coupled to its own ferromagnetic lead, while the coupling between the dots is relatively weak. The current flowing through the system is determined within perturbation theory in the hopping between the dots, whereas the spectrum of a quantum-dot-ferromagnetic-lead subsystem is determined by means of the numerical renormalization group method. The spin-dependent charge fluctuations between ferromagnets and quantum dots generate an effective exchange field, which splits the double-dot levels. Such a field can be controlled, separately for each quantum dot, by the gate voltages or by changing the magnetic configuration of the external leads. We demonstrate that the considered double-quantum-dot spin-valve setup exhibits enhanced magnetoresistive properties, including both normal and inverse tunnel magnetoresistance. We also show that this system allows for the generation of highly spin-polarized currents, which can be controlled by purely electrical means. The considered double quantum dot with ferromagnetic contacts can thus serve as an efficient voltage-tunable spin valve characterized by high output parameters. © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. LA - English DB - MTMT ER - TY - JOUR AU - Elalaily, Tosson AU - Kürtössy, Olivér AU - Zannier, Valentina AU - Scherübl, Zoltán AU - Lukács, István Endre AU - Srivastava, Pawan AU - Rossi, Francesca AU - Sorba, Lucia AU - Csonka, Szabolcs AU - Makk, Péter TI - Probing Proximity-Induced Superconductivity in InAs Nanowires Using Built-In Barriers JF - PHYSICAL REVIEW APPLIED J2 - PHYS REV APPL VL - 14 PY - 2020 IS - 4 PG - 8 SN - 2331-7019 DO - 10.1103/PhysRevApplied.14.044002 UR - https://m2.mtmt.hu/api/publication/31701894 ID - 31701894 AB - Bound states in superconductor-nanowire hybrid devices play a central role, carrying information on ground-state properties (Shiba or Andreev states) or on the topological properties of the system (Majorana states). The spectroscopy of such bound states relies on the formation of well-defined tunnel barriers, usually defined by gate electrodes, which results in smooth tunnel barriers. Here we used thin InP segments embedded into InAs nanowire during the growth process to form a sharp built-in tunnel barrier. Gate dependence and thermal-activation measurements are used to confirm the presence and estimate the height of this barrier. By coupling these wires to superconducting electrodes we investigate the gate voltage dependence of the induced gap in the nanowire segment, which we can understand using a simple model based on Andreev bound states. Our results show that these built-in barriers are promising as future spectroscopic tools. LA - English DB - MTMT ER - TY - JOUR AU - Frank, György AU - Scherübl, Zoltán AU - Csonka, Szabolcs AU - Zaránd, Gergely Attila AU - Pályi, András TI - Magnetic degeneracy points in interacting two-spin systems: Geometrical patterns, topological charge distributions, and their stability JF - PHYSICAL REVIEW B J2 - PHYS REV B VL - 101 PY - 2020 IS - 24 PG - 14 SN - 2469-9950 DO - 10.1103/PhysRevB.101.245409 UR - https://m2.mtmt.hu/api/publication/31385303 ID - 31385303 N1 - Funding Agency and Grant Number: National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]; OTKA by the New National Excellence Program of the Ministry of Human Capacities [124723, 127900, 132146]; AndQC FetOpen project; BME-Nanotechnology FIKP grant (BME FIKP-NAT); QuantERA SuperTop project Funding text: We thank G. Pinter, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 22 July 2020 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 30 July 2020 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 25 August 2020 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 10 February 2021 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 11 February 2021 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 3 May 2021 Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 4 May 2021 Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 28 May 2021 Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 20 September 2021 Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Funding Agency and Grant Number: National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence ProgramNational Research, Development & Innovation Office (NRDIO) - Hungary [2017-1.2.1-NKP-2017-00001]; OTKA by the New National Excellence Program of the Ministry of Human Capacities [124723, 127900, 132146]; AndQC FetOpen project; BME-Nanotechnology FIKP grant (BME FIKP-NAT); QuantERA SuperTop project Funding text: We thank G. Pinter, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. Department of Physics, Budapest University of Technology and Economics, MTA-BME Momentum, Nanoelectronics Research Group, Budafoki út 8., Budapest, H-1111, Hungary Department of Theoretical Physics, MTA-BME Exotic Quantum Phases Momentum Research Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary MTA-BME Quantum Correlations Group, Budapest University of Technology and Economics, Budapest, H-1111, Hungary Export Date: 23 September 2021 Funding details: 2017-1.2.1-NKP-2017-00001 Funding details: Hungarian Scientific Research Fund, OTKA, 124723, 127900, 132146 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding text 1: We thank G. Pintér, P. Vrana, and H. Weng for useful discussions. This work was supported by the National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program (Project No. 2017-1.2.1-NKP-2017-00001), under OTKA Grants No. 124723, No. 127900, and No. 132146 by the New National Excellence Program of the Ministry of Human Capacities, by the BME-Nanotechnology FIKP grant (BME FIKP-NAT), by the QuantERA SuperTop project, and by the AndQC FetOpen project. LA - English DB - MTMT ER - TY - JOUR AU - Kovács-Krausz, Zoltán AU - Hoque, Anamul Md AU - Makk, Péter AU - Szentpéteri, Bálint AU - Kocsis, Mátyás AU - Fülöp, Bálint AU - Yakushev, Michael Vasilievich AU - Kuznetsova, Tatyana Vladimirovna AU - Tereshchenko, Oleg Evgenevich AU - Kokh, Konstantin Aleksandrovich AU - Lukács, István Endre AU - Taniguchi, Takashi AU - Watanabe, Kenji AU - Dash, Saroj Prasad AU - Csonka, Szabolcs TI - Electrically Controlled Spin Injection from Giant Rashba Spin–Orbit Conductor BiTeBr JF - NANO LETTERS J2 - NANO LETT VL - 20 PY - 2020 IS - 7 SP - 4782 EP - 4791 PG - 10 SN - 1530-6984 DO - 10.1021/acs.nanolett.0c00458 UR - https://m2.mtmt.hu/api/publication/31357113 ID - 31357113 LA - English DB - MTMT ER - TY - JOUR AU - Kun, Péter AU - Fülöp, Bálint AU - Dobrik, Gergely AU - Nemes Incze, Péter AU - Lukács, István Endre AU - Csonka, Szabolcs AU - Hwang, Chanyong AU - Tapasztó, Levente TI - Robust quantum point contact operation of narrow graphene constrictions patterned by AFM cleavage lithography JF - NPJ 2D MATERIALS AND APPLICATIONS J2 - NPJ 2D MATER APPL VL - 4 PY - 2020 IS - 1 PG - 6 SN - 2397-7132 DO - 10.1038/s41699-020-00177-x UR - https://m2.mtmt.hu/api/publication/31779701 ID - 31779701 LA - English DB - MTMT ER -