Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Poster Session: Spintronics; Spin-controled transport; Topological insulators; Interfaces / Surfaces; Magnetic semiconductors
HL 29.6: Poster
Montag, 11. März 2013, 16:00–20:00, Poster A
Spin dynamics in high-mobility two-dimensional electron systems embedded in GaAs/AlGaAs quantum wells — •M. Griesbeck1, M. Glazov2, E. Sherman3, T. Korn1, D. Schuh1, W. Wegscheider4, and C. Schüller1 — 1Department of physics, Regensburg university, Germany — 2Ioffe Physical-Technical Institute, St. Petersburg, Russia — 3Department of Physical Chemistry, University of the Basque Country, Bilbao, Spain — 4ETH Zürich, Switzerland
Advances in the technology of GaAs/AlGaAs based heterostructures allow for the design of high quality and well-defined two-dimensional electron systems (2DES), which are perfectly suited for the study of the underlying physics that govern the dynamics of the electron spin system. In this work, spin dynamics in high-mobility 2DES is studied by means of the all-optical time-resolved Kerr/Faraday rotation technique. In (001)-grown 2DES, an in-plane spin dephasing anisotropy is studied, resulting from the interference of comparable Rashba and Dresselhaus contributions to the spin-orbit field (SOF). The dependence of this anisotropy on the confinement length of the 2DES, the sample temperature and the carrier density is demonstrated. Moreover, coherent spin dynamics of an ensemble of ballistically moving electrons is studied within a weak magnetic field applied perpendicular to the sample plane, which forces the electrons to move on cyclotron orbits. Finally, anisotropic spin dynamics is investigated in symmetric (110)-grown 2DES, using the resonant spin amplification method. In such systems, very long out-of-plane spin dephasing times can be achieved, in consequence of the special symmetry of the Dresselhaus SOF.