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TT: Fachverband Tiefe Temperaturen

TT 101: Transport - Poster Session

TT 101.36: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Magnetic impurities at the edge of a two-dimensional topological insulator — •Johanna Kleinen, Markus Garst, and Achim Rosch — Institut für Theoretische Physik, Universität zu Köln, Germany

We investigate the effect of a magnetic impurity in a helical Luttinger liquid representing the edge states of a two-dimensional topological insulator. Analyzing the renormalization group flow in the presence of Kondo- as well as Rashba-interactions, we find that the magnetic impurity always couples strongly to the spin-polarized electrons. Moreover, we identify, in principle, two strong-coupling fixed-points with completely different transport characteristics. The magnetic impurity might either be Kondo-screened and only forward-scattering the electrons or it could develop into a strong backscatterer effectively inhibiting transport along the edge.