Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 9: Transport: Topological Insulators 1 (jointly with TT, MA)

HL 9.13: Talk

Monday, March 26, 2012, 12:45–13:00, H 3010

Luttinger Liquid Physics and Spin-Flip Scattering on Helical Edges — •Martin Hohenadler and Fakher Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Würzburg, Deutschland

We investigate electronic correlation effects on edge states of quantum spin Hall insulators within the Kane-Mele-Hubbard model by means of quantum Monte Carlo simulations. In accordance with Luttinger liquid theory, we find dominant transverse spin fluctuations with an interaction dependent power law and the expected doping dependence. For strong electronic correlations, bulk states become important, and high-energy spectral features beyond Luttinger liquid theory emerge. Inelastic spin-flip scattering leads to graphene-like edge state signatures, and transfers spectral weight from low to high energies causing a suppression of charge transport.