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Circular Photogalvanic Effect in SiGe Semiconductor Quantum Wells

Published online by Cambridge University Press:  17 March 2011

Sergey D. Ganichev ,
Franz-Peter Kalz ,
Ulrich Rössler ,
Wilhelm Prettl ,
Eugenius L. Ivchenko ,
Vasily V. Bel'kov ,
Robert Neumann ,
Karl Brunner  and
Gerhard Abstreiter
Sergey D. Ganichev
Affiliation:
Fakultäat für Physik, Universitäat Regensburg, 93040 Regensburg, Germany A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
Franz-Peter Kalz
Affiliation:
Fakultäat für Physik, Universitäat Regensburg, 93040 Regensburg, Germany
Ulrich Rössler
Affiliation:
Fakultäat für Physik, Universitäat Regensburg, 93040 Regensburg, Germany
Wilhelm Prettl
Affiliation:
Fakultäat für Physik, Universitäat Regensburg, 93040 Regensburg, Germany
Eugenius L. Ivchenko
Affiliation:
A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
Vasily V. Bel'kov
Affiliation:
A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia
Robert Neumann
Affiliation:
Walter Schottky Institute, TU Munich, D-85748 Garching, Germany
Karl Brunner
Affiliation:
Walter Schottky Institute, TU Munich, D-85748 Garching, Germany
Gerhard Abstreiter
Affiliation:
Walter Schottky Institute, TU Munich, D-85748 Garching, Germany
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Abstract

The photogalvanic effects, which require a system lacking inversion symmetry, become possible in SiGe based quantum well (QW) structures due to their built-in asymmetry. We report on observations of the circular and linear photogalvanic effects induced by infrared radiation in (001)-and (113)-orientedp–Si/Si1–xGex QW structures and analyse these observations in view of the possible symmetry of these structures. The circular photogalvanic effect arises due to optical spin orientation of free carriers in QWs with band splitting in k-space which results in a directed motion of free carriers in the plane of the QW. We discuss possible mechanisms that give rise to spin-splitting of the electronic subband states for different symmetries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 690: Symposium F – Spintronics , 2001 , F3.11
Copyright
Copyright © Materials Research Society 2002

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References

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