Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 34: Spin controlled transport II

HL 34.4: Vortrag

Mittwoch, 25. März 2009, 14:45–15:00, BEY 118

Non-local edge state transport in the quantum spin Hall state — •Andreas Roth, Nina Eikenberg, Christoph Brüne, Hartmut Buhmann, and Laurens W. Molenkamp — Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg, Germany

In 2007 the quantum spin Hall insulator state was discovered in HgTe quantum well structures as a new state of matter. In contrast to conventional electronic devices where currents flow through the bulk satisfying the classical Ohm's law, in the quantum spin Hall insulator electric currents are confined to flow only along the edges of the sample. In order to verify the concept of edge channel transport we investigate the non-locality in multiterminal devices. The agreement with Landauer-Büttiker calculations confirm the edge channel character of quantum spin Hall states.