Cyclotron effect on coherent spin precession of two-dimensional electrons

M. Griesbeck, M. M. Glazov, T. Korn, C. Reichl, D. Schuh, W. Wegscheider, C. Schüller

Research outputpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 30th International Conference on the Physics of Semiconductors, ICPS-30
Pages727-728
Number of pages2
Volume1399
DOIs
Publication statusPublished - 1 Dec 2011
Event30th International Conference on the Physics of Semiconductors, ICPS-30 - Seoul
Duration: 25 Jul 201030 Jul 2010

Conference

Conference30th International Conference on the Physics of Semiconductors, ICPS-30
CountryKorea, Republic of
CitySeoul
Period25/07/1030/07/10

Scopus subject areas

  • Physics and Astronomy(all)

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