Dresden 2009 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 34: Spin controlled transport II
HL 34.2: Talk
Wednesday, March 25, 2009, 14:15–14:30, BEY 118
Ballistic Intrinsic Spin-Hall Effect in HgTe Nanostructures — •Christoph Brüne1, Andreas Roth1, Elena G. Novik1, Markus König1, Ewelina Hankiewicz2, Hartmut Buhmann1, and Laurens W. Molenkamp1 — 1Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg, Germany — 2Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany
Due to their unique band structure and the high spin orbit coupling strength, HgTe/HgCdTe quantum wells provide a good system for the observation of spin dependend transport phenomena. In this work we used nano-scale H-shaped structures built on HgTe/HgCdTe quantum wells to detect the intrinsic spin-Hall effect (ISHE) in a non-local electrical measurement. The strength of the spin orbit coupling was controlled by a top gate, which also made a transition from n- to p-conductance possible. The observed non-local resistance signal in the p-regime is in the order of kΩ. In contrast in the n-regime the signal is at least an order of magnitude lower. These observations are in agreement with bandstructure considerations and are confirmed by detailed Landauer-Büttiker-Keldysh formalism calculations.