Chiral d-wave superconductivity in SrPtAs: A Weyl superconductor

ORAL

Abstract

Recent $\mu$SR measurements suggest that the hexagonal pnictide SrPtAs is a chiral d-wave superconductor that spontaneously breaks time-reversal symmetry in the superconducting state. The $d$-wave order parameter fully gaps all Fermi surfaces, except for point nodes on one Fermi surface sheet near the $K$ and $K'$ points at the Brillouin zone corners. Theses nodal points are Majorana-Weyl fermions in momentum space. We study the topological characteristics of this superconducting phase, which features protected chiral surface states, Majorana-Fermi arcs on the surface and an associated thermal Hall response.

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Authors

  • Titus Neupert

    • Princeton University

  • Mark Fischer

    • Weizmann Institute

  • Christian Platt

    • University of Wuerzburg

  • Andreas Schnyder

    • Max Planck Institute for Solid State Research

  • Werner Hanke

    • University of Wuerzburg

  • Ronny Thomale

    • University of Wuerzburg

  • Manfred Sigrist

    • ETH Zurich

  • Jun Goryo

    • Hirosaki University