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)

*The project received support from NOMIS foundation.

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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