Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties

HL 44.17: Poster

Dienstag, 27. März 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)