Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects

Abstract

We investigate the possibility of realizing quantum anomalous Hall effect in graphene. We show that a bulk energy gap can be opened in the presence of both Rashba spin-orbit coupling and an exchange field. We calculate the Berry curvature distribution and find a non-zero Chern number for the valence bands and demonstrate the existence of gapless edge states. Inspired by this finding, we also study, by first principles method, a concrete example of graphene with Fe atoms adsorbed on top, obtaining the same result.

4 papges, 5 figures

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Cited by in corpus (2)

• Quantum anomalous Hall states in the $p$-orbital honeycomb optical lattices
• Non-local exchange effects in zigzag edge magnetism of neutral graphene nanoribbons