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Symmetry breaking effects in SNS junctions with a proxitimized planar germanium hole gas

ORAL

Abstract

Planar Ge offers an attractive platform for developing and integrating quantum devices due to inherently strong spin-orbit coupling and large perpendicular g-factor. However, most studies characterize these physical properties in zero and one-dimensional systems [1,2]. In two-dimensional systems, heavy hole-light hole mixing can result in marked corrections to these properties. Here we explore the evolution of Fraunhofer diffraction patterns in a proximitized Ge junction, a direct probe of supercurrent density, in presence of an in-plane magnetic field. We observe significant changes in Fraunhofer pattern depending on the direction of in-plane magnetic field and relate them to the symmetries of the Hamiltonian of this hybrid system. We investigate the evolution of supercurrent density with in-plane magnetic field to elucidate the interplay of spin-orbit interaction, Zeeman splitting and disorder in planar Ge.

[1] Hendrickx, et al., Nature Comm 9, 2835 (2018)

[2] Mizokuchi, et al., Nano Lett. 18, 8, 4861-4865 (2018)

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Presenters

  • Kushagra Aggarwal

    University of Oxford

Authors

  • Kushagra Aggarwal

    University of Oxford

  • Marco Valentini

    Institute of Science and Technology Austria

  • Andrea Hofmann

    Department of Physics, University of Basel, University of Basel

  • Andrea Ballabio

    L-NESS, Physics Department, Politecnico di Milano, Politecnico di Milano, L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy, L-NESS, Physics Department, Politecnico di Milano, via Anzani 42, 22100, Como, Italy, L-NESS, Politecnico di Milano

  • Daniel Chrastina

    L-NESS, Physics Department, Politecnico di Milano, Politecnico di Milano, L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy, L-NESS, Physics Department, Politecnico di Milano, via Anzani 42, 22100, Como, Italy, L-NESS, Politecnico di Milano

  • Giovanni Isella

    L-NESS, Physics Department, Politecnico di Milano, Politecnico di Milano, L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy, L-NESS, Politecnico di Milano

  • Jeroen Danon

    Norwegian Univ Tech (NTNU), Norwegian University of Science and Technology

  • Georgios Katsaros

    Institute of Science and Technology Austria, IST Austria, Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria, Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria