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We show that a two-dimensional topological superconductor (TSC) can berealized in a hybrid system with a conventional $s$-wave superconductorproximity-coupled to a quantum anomalous Hall (QAH) state from the Rashba andexchange effects in single layer graphene. With very low or even zero dopingnear the Dirac points, i.e., two inequivalent valleys, this TSC has a Chernnumber as large as four, which supports four Majorana edge modes. Moreimportantly, we show that this TSC has a robust topologically nontrivial bulkexcitation gap, which can be larger or even one order of magnitude larger thanthe proximity-induced superconducting gap. This unique property paves a way forthe application of QAH insulators as seed materials to realize robust TSCs andMajorana modes.

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