Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.49: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Quantum dot coupled to a quantum spin Hall edge — •Benedikt Probst and Patrik Recher — Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany

In topological insulators new interesting states of matter are realised. In two dimensional topological insulators the quantum spin Hall effect was predicted and observed [1-3]. In this effect the different spin polarisations propagate in opposite directions, which gives new perspectives for spintronic devices.

We couple a quantum dot in the Coulomb blockade regime to an helical edge, where the quantum dot can be treated as a spin impurity. We discuss the behaviour of the impurity in an open quantum system approach. The helical edge is used as a bath and to manipulate the dot spin. We also discuss the transport signature of this system.
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M. König, S. Wiedemann, C. Brüne, A. Roth, H. Buhmann, L. W. Molenkamp, X.-L. Qi and S.-C. Zhang, Science 318, 766 (2007)
A. Roth, C. Brüne, H. Buhmann, L. W. Molenkamp, J. Maciejko, X.-L. Qi and S.-C. Zhang, Science 325, 294 (2009)