Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Topological insulators (TT, jointly with DS, HL, MA)

HL 85.10: Talk

Thursday, March 14, 2013, 17:45–18:00, H18

The Kondo cloud in helical edge states — •Thore Posske and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg, 97074 Würzburg, Germany

The Kondo cloud is one of the last left unobserved phenomena of the Kondo effect. It stands for spatially extended spin-spin correlation between the electrons in the leads and the spin of the impurity in a Kondo system. Attempts to measure the Kondo cloud directly at the impurity usually perturb the system vastly and therefore modify the Kondo cloud. Helical edge states of topological insulators obey a unique coupling of the direction of motion and the spin degree of freedom. This, as we show, allows for the possibility to find signatures of the Kondo cloud far away from its origin by measuring current-current correlations.