Topological D+p-wave superconductivity in Rashba systems

Tomohiro Yoshida and Youichi Yanase
Phys. Rev. B 93, 054504 – Published 2 February 2016

Abstract

We show two-dimensional “strong” topological superconductivity in d-wave superconductors (SCs). Although the topological invariant of the bulk wave function cannot be defined in dx2y2-wave and dxy-wave SCs because of nodal excitations, the bulk energy spectrum of d-wave SCs on a substrate is fully gapped in a magnetic field. Then the superconducting state is specified by a nontrivial Chern number, and hence topologically nontrivial properties are robust against disorders and interactions. We discuss high-temperature topological superconductivity in cuprate SCs recently fabricated on a substrate. Furthermore, we show that the three-dimensional noncentrosymmetric d-wave SC is a Weyl SC hosting topologically protected Weyl nodes. Noncentrosymmetric heavy-fermion SCs, such as CeRhSi3 and CeIrSi3, are candidates for Weyl SCs.

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  • Received 3 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.054504

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Tomohiro Yoshida1 and Youichi Yanase2,*

  • 1Department of Physics, Gakushuin University, Tokyo 171-8588, Japan
  • 2Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • *yanase@scphys.kyoto-u.ac.jp

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Issue

Vol. 93, Iss. 5 — 1 February 2016

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