Spin Josephson effect at the quantum spin Hall edge

ORAL

Abstract

We study a spin Josephson effect in a ferromagnetic junction at the quantum spin Hall (QSH) edge. The helical nature of the QSH edge states has striking consequences for the transport properties of such a junction. We derive an expression for the spin current through the junction as a function of the change in magnetization, similar to the current-phase relation of a Josephson junction. We discuss the novel transport properties of the junction that result from fractionally charged excitations hosted by the QSH edge.

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Authors

  • Vasudha Shivamoggi

    • Department of Physics, University of Illinois

  • Qinglei Meng

    • Department of Physics, University of Illinois
    • UIUC

  • Taylor Hughes

    • UIUC Physics Dept
    • University of Illinois at Urbana Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois

  • Matthew Gilbert

    • Department of Electrical and Computer Engineering, the University of Illinois at Urbana-Champaign
    • Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Department of Electrical and Computer Engineering, University of Illinois
    • Department of Electrical and Computer Engineering, University of Illinois, Urbana IL 61801
    • Department of Electrical and Computer Engineering, University of Illinois, Urbana, Il, 61801
    • University of Illinois at Urbana Champaign

  • Smitha Vishveshwara

    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois