Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 23: Transport in high magnetic field/quantum-Hall-effect
HL 23.5: Vortrag
Dienstag, 24. März 2009, 15:00–15:15, BEY 154
Optical manipulation of edge state transport in HgTe quantum wells — •Manuel Schmidt1, Markus Kindermann2, Alena Novik3, and Björn Trauzettel3 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland — 2School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA — 3Fakultät für Physik und Astronomie, University of Würzburg, 97074 Würzburg, Germany
We investigate the influence of electromagnetic radiation on edge state transport within an effective model for the band structure of a HgTe quantum well. This effective model describes the quantum well especially well near its mass inversion thickness [1], where it is sufficient to take the first pair of hole- and electron-like bands into account.
We show that, in an experimentally accessible regime, the motion of an electron which traverses one edge can be reversed. The mechanism behind this current direction inversion is the optical scattering of electrons in hole-like, counterclockwise moving states to electron-like, clockwise moving states.
[1] B. A. Bernevig, T. L. Huges, and S. Zhang, Science 314, 1757 (2006).