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Tunneling spectroscopy of DC voltage biased planar Josephson junctions in a hybrid Al/InAs two-dimensional electron gas heterostructure

ORAL

Abstract

Planar Josephson junctions (JJs) fabricated on a hybrid epitaxial Al-InAs two-dimensional electron gas (2DEG) heterostructure are a rich playground for exploration of topological superconductivity. The combination of a gate-tunable semiconductor possessing low disorder, strong spin-orbit coupling, and large g-factor with a s-wave superconductivity allows for examination many possible state configurations. DC voltage-biased planar JJs are predicted to host Majorana zero and Floquet Majorana modes simultaneously at their two ends. Here, we fabricate and measure gate-tunable planar JJs on epitaxial Al-InAs 2DEGs with two tunneling probes for measuring the density of states at two ends of the junction. We report on the density of states at two ends of the junction as a function of the DC bias voltage across the junction, the in-plane magnetic field, and the electron density in the junction. Comparisons to theoretical expectations are made.

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Presenters

  • Teng Zhang

    Department of Physics and Astronomy and Birck Nanotechnology Center Purdue University

Authors

  • Teng Zhang

    Department of Physics and Astronomy and Birck Nanotechnology Center Purdue University

  • Tyler Lindemann

    Department of Physics and Astronomy and Birck Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette

  • Michael J Manfra

    Purdue University, Microsoft Quantum Purdue, Purdue University, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA, Physics and Astronomy, Purdue University, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University, Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette, Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University