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1/B resistance oscillations within the superconducting regime of heterostructure with disordered superconductor

ORAL

Abstract

In-situ growth of Al on top of shallow InAs 2DEG heterostructures gives close to perfect superconducting proximity effect [1]. In recent work, we used anodic oxidation to thin down the Al by oxidizing from the top down, allowing us to create an ultra-thin and disordered Al film with a large perpendicular critical field Bc >3 T on a mesoscopic structure. [2]
For B>Bc, the sample resistance rises to >1 kΩ whereas for B<Bc, we observe reproducible resistance oscillations of <30 Ω. The oscillations have a 1/B periodicity from which standard SdH analysis yields a density matching closely with the carrier density of the underlying 2DEG. This indicates strong electronic contact between the disordered Al layer and the high mobility InAs 2DEG, creating a novel material system to study disordered 2D superconductivity.
Furthermore, fully oxidizing the Al layer gives rise to quantum Hall effect (ρxx=0) emerging at B~2.5 T [2] making this material system a candidate for studying proximitized quantum Hall edge states with close to unity transparency to the superconducting Al, contacting the 2DEG from the top.

[1] M. Kjærgaard et al. Nature commun. 12841 (2016)
[2] A. C. C. Drachmann et al. work in progress (2019)

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Presenters

  • Asbjorn Drachmann

    Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen

Authors

  • Asbjorn Drachmann

    Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen

  • Abhishek Banerjee

    Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen, Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Antonio Fornieri

    Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen, Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Alexander Whiticar

    Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen, Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Candice Thomas

    Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, Microsoft Quantum at Station Q Purdue, Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Purdue University, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA

  • Sergei Gronin

    Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, Microsoft Quantum at Station Q Purdue, Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA, Microsoft Quantum Purdue

  • Tiantian Wang

    Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University

  • Geoff C Gardner

    Purdue University, Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA, Microsoft Quantum Purdue, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • Michael Manfra

    Physics and Astronomy, Purdue Univ, Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue, Purdue Univ, Purdue University, Microsoft Quantum at Station Q Purdue, Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P, Physics and Astronomy, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Department of Physics and Astronomy, PURDUE UNIVERSITY, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • Charles Marcus

    Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, Microsoft Quantum Lab Copenhagen and Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Univ of Copenhagen, Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen, Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen, Microsoft Corp, Niels Bohr Institute, University of Copenhagen