High‐mobility two‐dimensional electron systems may be one of the bases of future spintronic devices, where the spin states of ballistic electrons could be manipulated via external gate voltages and the resulting spin‐orbit fields. Therefore, the knowledge of spin dynamics in such systems is of technical interest and offers on the other side an exciting view on the underlying physics. Here, we present time‐resolved Faraday rotation measurements in a high‐mobility two‐dimensional electron system in a GaAs/AlGaAs quantum well structure grown along the [001] direction. Even without applied external magnetic fields the optically generated spin ensemble shows a coherent precession about the effective spin‐orbit field. If a nonquantizing magnetic field is applied normal to the sample plane, the effective spin‐orbit fields are rotated by the cyclotron motion of the electrons. This rotation leads to fast oscillations in the spin polarization about a nonzero value and an strong increase of the spin dephasing times. The measurement data is in excellent agreement with a model based on a kinetic equation approach.
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23 December 2011
PHYSICS OF SEMICONDUCTORS: 30th International Conference on the Physics of Semiconductors
25–30 July 2010
Seoul, (Korea)
Research Article|
December 23 2011
Cyclotron effect on coherent spin precession of two‐dimensional electrons
M. Griesbeck;
M. Griesbeck
aInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, D‐93040 Regensburg, Germany
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M. M. Glazov;
M. M. Glazov
bA.F. Ioffe Physical‐Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
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T. Korn;
T. Korn
aInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, D‐93040 Regensburg, Germany
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C. Reichl;
C. Reichl
aInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, D‐93040 Regensburg, Germany
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D. Schuh;
D. Schuh
aInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, D‐93040 Regensburg, Germany
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W. Wegscheider;
W. Wegscheider
cSolid State Physics Laboratory, ETH Zürich, 8093 Zurich, Switzerland
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C. Schüller
C. Schüller
aInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, D‐93040 Regensburg, Germany
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AIP Conf. Proc. 1399, 727–728 (2011)
Citation
M. Griesbeck, M. M. Glazov, T. Korn, C. Reichl, D. Schuh, W. Wegscheider, C. Schüller; Cyclotron effect on coherent spin precession of two‐dimensional electrons. AIP Conf. Proc. 23 December 2011; 1399 (1): 727–728. https://doi.org/10.1063/1.3666583
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