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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.11: Poster

Wednesday, March 13, 2013, 15:00–19:00, Poster D

π fluxes near the edge of a quantum spin Hall insulator — •Manuel Weber and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Inserting a π flux into a quantum spin Hall insulator creates four spin-charge separated states in the bandgap - two spin fluxons, which form a Kramers doublet, and two charge fluxons. They lead to a characteristic Curie law in the magnetic susceptibility of both free and interacting systems. We study single π fluxes in close distance to the edge states of the Kane-Mele model on a ribbon. Numerical investigations of the susceptibility in the noninteracting model show the Curie law down to low temperatures even for π fluxes located directly at the edge. This can be interpreted as a consequence of the π fluxes’ quantum numbers, which inhibit coupling to the edge mode in the absence of interactions. Using CTQMC simulations we investigate the coupling of the π flux to the edge states, when correlations are taken into account.