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      Gate-Controlled Supercurrent in Epitaxial Al/InAs Nanowires

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          Abstract

          Gate-controlled supercurrent (GCS) in superconducting nanobridges has recently attracted attention as a means to create superconducting switches. Despite the clear advantages for applications, the microscopic mechanism of this effect is still under debate. In this work, we realize GCS for the first time in a highly crystalline superconductor epitaxially grown on an InAs nanowire. We show that the supercurrent in the epitaxial Al layer can be switched to the normal state by applying ≃±23 V on a bottom gate insulated from the nanowire by a crystalline hBN layer. Our extensive study of the temperature and magnetic field dependencies suggests that the electric field is unlikely to be the origin of GCS in our device. Though hot electron injection alone cannot explain our experimental findings, a very recent non-equilibrium phonons based picture is compatible with most of our results.

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          Most cited references 46

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          Carbon nanotube superconducting quantum interference device

          A superconducting quantum interference device (SQUID) with single-walled carbon nanotube (CNT) Josephson junctions is presented. Quantum confinement in each junction induces a discrete quantum dot (QD) energy level structure, which can be controlled with two lateral electrostatic gates. In addition, a backgate electrode can vary the transparency of the QD barriers, thus permitting change in the hybridization of the QD states with the superconducting contacts. The gates are also used to directly tune the quantum phase interference of the Cooper pairs circulating in the SQUID ring. Optimal modulation of the switching current with magnetic flux is achieved when both QD junctions are in the 'on' or 'off' state. In particular, the SQUID design establishes that these CNT Josephson junctions can be used as gate-controlled pi-junctions; that is, the sign of the current-phase relation across the CNT junctions can be tuned with a gate voltage. The CNT-SQUIDs are sensitive local magnetometers, which are very promising for the study of magnetization reversal of an individual magnetic particle or molecule placed on one of the two CNT Josephson junctions.
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            Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe13

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              Electron tunneling through ultrathin boron nitride crystalline barriers.

              We investigate the electronic properties of ultrathin hexagonal boron nitride (h-BN) crystalline layers with different conducting materials (graphite, graphene, and gold) on either side of the barrier layer. The tunnel current depends exponentially on the number of h-BN atomic layers, down to a monolayer thickness. Conductive atomic force microscopy scans across h-BN terraces of different thickness reveal a high level of uniformity in the tunnel current. Our results demonstrate that atomically thin h-BN acts as a defect-free dielectric with a high breakdown field. It offers great potential for applications in tunnel devices and in field-effect transistors with a high carrier density in the conducting channel. © 2012 American Chemical Society
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                Author and article information

                Journal
                Nano Lett
                Nano Lett
                nl
                nalefd
                Nano Letters
                American Chemical Society
                1530-6984
                1530-6992
                02 November 2021
                24 November 2021
                : 21
                : 22
                : 9684-9690
                Affiliations
                []Department of Physics and Nanoelectronics “Momentum” Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics , Budafoki ut 8, 1111 Budapest, Hungary
                []Department of Physics, Faculty of Science, Tanta University , Al-Geish Street, 31527 Tanta, Gharbia, Egypt
                []Université Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS , 38000 Grenoble, France
                []Center for Energy Research, Institute of Technical Physics and Material Science , Konkoly-Thege Miklós út 29-33., H-1121 Budapest, Hungary
                [# ]Center for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen , Universitetsparken 5, DK-2100 Copenhagen, Denmark
                []Research Center for Functional Materials, National Institute for Material 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
                Author notes
                Article
                10.1021/acs.nanolett.1c03493
                8631737
                34726405
                39ee735e-f5bd-4348-80df-4b38b40f6228
                © 2021 The Authors. Published by American Chemical Society

                Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained ( https://creativecommons.org/licenses/by/4.0/).

                Funding
                Funded by: H2020 Future and Emerging Technologies, doi 10.13039/100010664;
                Award ID: 828948
                Funded by: Topograph FlagERA, doi NA;
                Award ID: NA
                Funded by: Innovációs és Technológiai Minisztérium, doi 10.13039/501100015498;
                Award ID: 2017-1.2.1-NKP-2017-00001
                Funded by: SuperTop QuantERA network, doi NA;
                Award ID: NA
                Funded by: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, doi 10.13039/501100011019;
                Award ID: 2017-1.2.1-NKP-2017-00001
                Funded by: Magyar Tudományos Akadémia, doi 10.13039/501100003825;
                Award ID: NA
                Funded by: Országos Tudományos Kutatási Alapprogramok, doi 10.13039/501100003549;
                Award ID: FK-123894
                Funded by: Carlsbergfondet, doi 10.13039/501100002808;
                Award ID: NA
                Funded by: Danmarks Grundforskningsfond, doi 10.13039/501100001732;
                Award ID: NA
                Funded by: Ministry of Education, Culture, Sports, Science and Technology, doi 10.13039/501100001700;
                Award ID: JPMXP0112101001
                Funded by: Japan Society for the Promotion of Science, doi 10.13039/501100001691;
                Award ID: JP20H00354
                Funded by: Japan Society for the Promotion of Science, doi 10.13039/501100001691;
                Award ID: 19H05790
                Funded by: H2020 Future and Emerging Technologies, doi 10.13039/100010664;
                Award ID: 964398
                Categories
                Letter
                Custom metadata
                nl1c03493
                nl1c03493

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