Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.52: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Magnetic impurities on edges of topological insulators — •Florian Goth and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

The realization of the Spin-Hall-Effect in quantum wells has led to a plethora of studies regarding the properties of the edge states of a 2D topological insulator. These edge states constitute a class of one-dimensional liquids, called the helical liquid, where an electron's spin direction is coupled to its direction of movement. In contrast to one dimensional conductors, magnetic impurities -- below the Kondo temperature -- cannot block transport and one expects the current to circumvent the impurity. To study this phenomenon, we consider the single impurity Anderson model embedded into an edge of a Kane-Mele ribbon and use numerically exact continuous time QMC methods to study the Kondo effect. We will present results on the temperature dependence of the double occupancy as well as on the local spin susceptibility. To track the edge state we equally compute the temperature dependence of the local spectral function.