Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Transport: Topological Insulators 3 (jointly with DS, HL, MA, O)
TT 42.7: Talk
Tuesday, March 17, 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 Brink1,2 — 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.