Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Low-dimensional systems: Topological order (organized by TT)

HL 90.4: Talk

Thursday, April 3, 2014, 10:15–10:30, HSZ 204

Fluctuation-Induced Topological Insulators — •Sebastian Riese and Stephan Rachel — Institut für Theoretische Physik, TU Dresden

We consider interaction-induced topological insulators as paradigms for systems which are dominated by the interplay of a topological band structure and electron-electron correlations. In particular, we extend the previous work about fluctuation-induced topological phases. We show that the fluctuation-induced Chern insulator phase can be reduced to the non-interacting model with an additional mass-term which depends on the parameters of the self-energy. Then we generalize this idea to the spinfull case of time-reversal invariant topological insulators. We show that his phase is stable with respect to spin-mixing in the band structure and in the self-energy. Implications for realistic interacting Hamiltonians are discussed.