Quantum anomalous Hall effect in graphene from Rashba and exchange effects

By Z. Qiao, Shengyuan A. Yang, W. Feng, Wang-Kong Tse, Jun Ding, Yugui Yao, Jian Wang, Q. Niu. 2010

440 citations recorded by the source corpus.

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 nonzero 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c4f6cda9adcfa0a193031688d1c6c0e443764a5d

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Spintronics and pseudospintronics in graphene and topological insulators. (2012, background): “ed2D not only as a spin - conserver but also as a spingenerator. A very large increase in Rashba spin- orbit coupling - strength can be achieved by covalent bonding withabsorbates[35][43][44] [45][46][47][48]. These findings suggest the possibility of creating lithographically defined spintronics de”
Periodically Driven Quantum Systems: Effective Hamiltonians and Engineered Gauge Fields (2014, background): “, honeycomb lattice), where the association of Rashba and Zeeman terms directly leads to Chern insulating phases [75,76].”
Colloquium : Spintronics in graphene and other two-dimensional materials (2019, background): “The band inversion resembles a time-reversal symmetric version of the quantum anomalous Hall effect proposed in graphene interacting with a heavy magnet (Qiao et al., 2014, 2010), where the term parametrized by λ can be interpreted as a valleydependent exchange coupling.”
Artificial gauge fields in materials and engineered systems (2017, positive): “A variety of two-band models exhibiting non-zero winding numbers have been proposed, [235,25], including the Haldane model [232] and lattices subjected to Rashba spin-orbit coupling [237,238,239].”
Electronic properties of graphene-based bilayer systems (2015, background): “Several theoretical and experimental works have addressed the effects of enhanced spin-orbit coupling in graphene by doping with heavy adatoms such as indium or thallium [137], doping with 3d/5d transition metal atoms [138, 139, 140], and interfacing with metal substrates, e.”