A tunable Josephson current in a Rashba Ring by Aharonov-Casher Phase

ORAL

Abstract

We study the interference effect induced by the Aharonov-Casher (A-C) phase on the transport between an asymmetrically confined two-dimensional electron ring system and the superconducting leads of a Josephson junction. The Josephson current and the Andreev levels are studied both analytically and numerically. Our results also predict oscillations in the Josephson current due to the A-C phase in the ring that can be tuned electrically via the spin-orbit (SO) interaction. Based on these oscillations, we propose a novel mechanism to observe the A-C phase in mesoscopic rings with gate tunable SO interaction attached to superconducting leads using the Josephson current oscillations. An applicable method to control the Josephson current by a tunable gate voltage can be realized due to these phenomena.

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Authors

  • Xin Liu

    Department of Physics, Texas A\&M University, College Station, Texas 77843-4242, USA, Department of Physics, Texas A\&M University, College Station, TX 77843-4242, USA

  • Mario F. Borunda

    Department of Physics, Texas A\&M University, College Station, Texas 77843-4242, USA, Department of Physics, Texas A\&M University, College Station, TX 77843-4242, USA

  • Xiong-Jun Liu

    Department of Physics, Texas A\&M University, College Station, Texas 77843-4242, USA, Department of Physics, Texas A\&M University, College Station, TX 77843-4242, USA

  • Jairo Sinova

    Texas A and M University, Department of Physics, Texas A\&M University, College Station, Texas 77843-4242, USA, Department of Physics, Texas A\&M University, College Station, TX 77843-4242, USA