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

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 four, 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 one 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.

arXiv comment10 pages, 5 figures, PRB in press

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Cited by in corpus (8)

• On the bulk boundary correspondence and the existence of Majorana bound states on the edges of 2D topological superconductors
• Chiral Majorana fermions in graphene from proximity-induced superconductivity
• Superconducting states and Majorana modes in transition-metal dichalcogenides under inhomogeneous strain
• Characterizations of topological superconductors: Chern numbers, edge states and Majorana zero modes
• Quantized Thermal Hall Conductance and the Topological Phase Diagram of a Superconducting Bismuth Bilayer
• Trivial and Non-trivial Superconductivity in dsDNA
• Chiral topological superconductivity in twisted bilayer and double bilayer graphene
• Chiral Majorana Fermions in two dimensional square lattice antiferromagnet with proximity-induced superconductivity