Transverse shift in Andreev reflection

ORAL

Abstract

An incoming electron is reflected back as a hole at a normal-metal–superconductor interface, a process known as Andreev reflection. We predict that there exists a universal transverse shift in this process due to the effect of spin-orbit coupling in the normal metal. Particularly, using both the scattering approach and the argument of angular momentum conservation, we demonstrate that the shifts are pronounced for lightly doped Weyl semimetals, and are opposite for incoming electrons with different chirality, generating a chirality-dependent Hall effect for the reflected holes. The predicted shift is not limited to Weyl systems, but exists for a general three-dimensional spin-orbit-coupled metal interfaced with a superconductor.

Ref: Phys. Rev. B 96, 121101(R)(2017).

*The authors thank D. L. Deng for valuable discussions. This work is supported by the Singapore MOE AcRF Tier 2 (MOE2015-T2-2-144) and Tier 1 (SUTD-T1-2015004).

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Presenters

  • Ying Liu

    • Engineering Product Development Pillar, Singapore University of Technology and Design

Authors

  • Ying Liu

    • Engineering Product Development Pillar, Singapore University of Technology and Design

  • Zhiming Yu

    • Singapore U. of Tec. and Design
    • Engineering Product Development Pillar, Singapore University of Technology and Design

  • Shengyuan Yang

    • Singapore University of Technology and Design
    • Research Laboratory for Quantum Materials, Singapore University of Technology and Design
    • Singapore U. of Tec. and Design
    • Engineering Product Development Pillar, Singapore University of Technology and Design