Emergent Relativistic Effects in Condensed Matter
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09.04.2018

Protected Pseudohelical Edge States in Z2 -Trivial Proximitized Graphene

Jaroslav Fabian and his group investigate topological properties of models that describe graphene on realistic substrates, which induce proximity spin-orbit coupling in graphene. Discussing how quantum anomalous Hall and quantum spin Hall effects arise in graphene, we also show how graphene with staggered intrinsic spin-orbit coupling, despite being topologically trivial, exhibits protected edge states. The spin character and robustness of the modes is best exhibited on a finite flake, which shows that the edge states have zero g-factor, carry a pure spin current in the crossection of the flake, and exhibit spin-flip reflectionless tunneling at the armchair edges.
See:
T. Frank, P. Högl, M. Gmitra, D. Kochan, and J. Fabian, Phys. Rev. Lett. 120, 156402 (2018)
 
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.156402

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