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