Topological superconductor with a large Chern number and a large bulk excitation gap in single-layer graphene

L. Wang and M. W. Wu
Phys. Rev. B 93, 054502 – Published 1 February 2016

Abstract

We show that a two-dimensional topological superconductor (TSC) can be realized in a hybrid system with a conventional s-wave superconductor proximity coupled to a quantum anomalous Hall (QAH) state from the Rashba and exchange effects in single-layer graphene. With very low or even zero doping near the Dirac points, i.e., two inequivalent valleys, this TSC has a Chern number as large as 4, which supports four Majorana edge modes. More importantly, we show that this TSC has a robust topologically nontrivial bulk excitation gap, which can be larger or even 1 order of magnitude larger than the proximity-induced superconducting gap. This unique property paves a way for the application of QAH insulators as seed materials to realize robust TSCs and Majorana modes.

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  • Received 11 September 2015
  • Revised 4 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.054502

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

L. Wang* and M. W. Wu

  • Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

  • *wlf@mail.ustc.edu.cn
  • mwwu@ustc.edu.cn

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Issue

Vol. 93, Iss. 5 — 1 February 2016

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