Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 4: Transport: Topological Insulators 1 (jointly with HL and MA)

TT 4.12: Talk

Monday, March 26, 2012, 12:30–12:45, H 3010

Aspects of electron-electron interactions and spin-conservation in topological insulators — •Stephan Rachel — Department of Physics, Yale University, New Haven, CT 06520, USA

We consider topological insulators on the honeycomb lattice and investigate the effect of electron-electron interactions and breaking of S_z spin-symmetry. We compare (i) non-interacting bandstructures with and without conserved spin, (ii) the regime of moderate interactions as well as (iii) the corresponding spin models. We find in all interaction-regimes qualitative differences between conserved and broken S_z spin-symmetry. The origin of these differences is explained. Eventually we discuss which of the effects are generic and which are specific for the honeycomb lattice.