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Josephson Interferometry of Zig-Zag Junctions Demonstrating Enhanced Localization

ORAL

Abstract

Josephson junctions on mercury telluride quantum wells combine strong spin-orbit effects, s-wave superconductivity, and arbitrary lithographic design. This platform facilitates both the study of induced superconductivity in the quantum well and topological states in quasi-1D systems. While zero bias peaks have been observed in these quasi-1D systems, small topological gaps and poor confinement of the 0-D topological states makes their assignment as Majorana fermions challenging. Recent theoretical work suggests an order of magnitude enhancement in the topological gap and localization when the Josephson junction is fabricated in a zig-zag geometry [1]. In this work, we provide the first characterization of zig-zag geometry junctions and demonstrate enhanced localization of electrons within the junction.

[1] T. Laeven, B. Nijholt, M. Wimmer, A. Akhmerov. arxiv:1903.06168.

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Presenters

  • Andrew Saydjari

    Harvard University

Authors

  • Andrew Saydjari

    Harvard University

  • Andrew Pierce

    Harvard University, Department of Physics, Harvard University

  • Hechen Ren

    Watson Laboratory of Applied Physics, California Institute of Technology, Harvard University, Watson Laboratory of Applied Physics, Caltech

  • Michael Kosowsky

    Harvard University

  • Christopher Ames

    University of Wurzburg

  • Martin Stenho

    University of Wurzburg

  • Laurens W Molenkamp

    University of Wurzburg

  • Amir Yacoby

    Harvard University, Department of Physics, Harvard University, Physics, Harvard University, Department of Physics, Harvard University, Cambridge, MA, 02138, USA