Metacinnabar (β-HgS): a strong 3D topological insulator with highly anisotropic surface states

Details Metacinnabar (β-HgS): a strong 3D topological insulator with highly anisotropic surface states Metacinnabar (β-HgS): a strong 3D topological insulator with highly anisotropic surface states

2011-05-03

arxiv.org/abs/1105.0501v2

Phys. Rev. Lett. 106, 236806 (2011)

Physics

Condensed Matter

Materials Science

Phys. Rev. Lett., in press

Scientific paper

We establish the presence of topologically protected edge states on the (001) surface of HgS in the zinc-blende structure using density-functional electronic structure calculations. The Dirac point of the edge state cone is very close to the bulk valence band maximum. The Dirac cone is extremely anisotropic with a very large electron velocity along one diagonal of the surface elementary cell x' and a nearly flat dispersion in the perpendicular direction y'. The strong anisotropy originates from a broken fourfold rotoinversion symmetry at the surface.

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