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HL: Fachverband Halbleiterphysik

HL 37: Transport: Topological insulators 3 (TT with HL/DS)

HL 37.7: Vortrag

Dienstag, 17. März 2015, 15:30–15:45, H 0110

One-dimensional Dirac electrons on the surface of weak topological insulators — •Alexander Lau¹, Carmine Ortix¹, and Jeroen van den Brink^1,2 — ¹Institute for Theoretical Solid State Physics, IFW Dresden, Germany — ²Department of Physics, TU Dresden, Germany

We show that a class of weak three-dimensional topological insulators feature one-dimensional Dirac electrons on their surfaces. Their hallmark is a line-like energy dispersion along certain directions of the surface Brillouin zone. Interestingly, these one-dimensional Dirac line degeneracies are topologically protected by a symmetry that we refer to as in-plane time-reversal invariance. As an example, we demonstrate how this invariance leads to Dirac lines in the surface spectrum of stacked Kane-Mele systems.