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HL: Fachverband Halbleiterphysik
HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties
HL 44.17: Poster
Tuesday, March 27, 2012, 09:30–12:30, Poster D
Energy dispersion and 3D magnetic anisotropy of electronand hole g-factors in (In,Ga)As/GaAs self-assembled quantum dots — •Alexander Schwan1, Britt-Marie Meiners1, Alex Greilich1, Anré B. Henriques2, Álvaro D. B. Maia2, Alain A. Quivy2, Steffen Varwig1, Stefan Spatzek1, Dmitri R. Yakovlev1, and Manfred Bayer1 — 1Experimentelle Physik 2, Technische UniversitätDortmund, 44221 Dortmund, Germany — 2Instituto de Física, Universidade de SãoPaulo, C.P. 66318, São Paulo, Brazil
The electron and hole Larmor spin precession was studied by time-resolved pump-probe Faraday rotation on an inhomogeneous ensemble of singly-charged self-assembled quantum dots. Dependence of electron g-factor on optical transition energy was measured. It is shown that the electron g-factors are similar for quantum dots with very different geometrical parameters, and their change with optical transition energy is almost identical[1].
The g-factor anisotropy was derived from the data measured in a
vector rotate magnet system, which allows full 360 degrees spherical
rotation of a magnetic field up to 3T. We determine all g-factor
tensor components, and found nearly isotropic electron g-factor and
a strong anisotropic hole g-factor.
[1] A. Schwan, B.-M. Meiners, A. B. Henriques, A. D. B. Maia, A. A.
Quivy, S. Spatzek, S. Varwig, D. R. Yakovlev, and M. Bayer. APL 98,
233102 (2011)