Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session I
HL 44.38: Poster
Dienstag, 15. März 2011, 18:00–21:00, P3
Hole spin dynamics in 2D hole systems in [113]-grown GaAs/AlGaAs quantum wells at low temperatures — •Stephan Furthmeier1, Michael Kugler1, Tobias Korn1, Michael Griesbeck1, Marika Hirmer1, Dieter Schuh1, Werner Wegscheider2, and Christian Schüller1 — 1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany — 2Solid State Physics Laboratory, ETH Zurich, Switzerland
For the realization of scalable solid-state quantum-bit systems, spins in semiconductor quantum dots are promising candidates. This has led to studies of low-temperature hole spin dynamics in two-dimensional hole systems (2DHS) in GaAs/AlGaAs quantum wells (QW) grown in the crystallographic direction [001]. Recently, calculations and experiments have shown that the effective hole g-factor g* can have different values for a magnetic field B applied in the direction normal to the plane of the 2DHS compared to in-plane. For directions other than the high-symmetry directions [001] and [111], it is theoretically predicted that, even for a purely in-plane B, g* can depend strongly on the orientation of B with respect to the crystal axes [1].
Here, we report on our experimental findings of hole spin dynamics in [113]-grown GaAs/AlGaAs QWs at low temperatures after optical excitation. Using the all-optical time-resolved Faraday rotation technique, we observe long-lived hole spin dephasing times in our sample at a temperature of 1.2 K. A complete angle-dependent series on the direction of the in-plane B with respect to the crystal axes is planned.
[1] R. Winkler et al., Phys. Rev. Lett. 85, 4574-4577 (2000).