Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 55: Quantum Dots and Wires, Optical Properties IV: Spin
HL 55.3: Talk
Thursday, March 25, 2010, 14:30–14:45, H14
Spin-ensembles in (In,Ga)As/GaAs quantum dots — •Alexander Schwan1, Stefan Spatzek1, Steffen Varwig1, Sophia E. Economou2, Alex Greilich1, Dmitri R. Yakovlev1, Dirk Reuter3, Andreas D. Wieck3, Thomas L. Reinecke2, and Manfred Bayer1 — 1Experimentelle Physik II, TU Dortmund, D-44221 Dortmund, Germany — 2Naval Research Laboratory, 20375 Washington DC, USA — 3Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
Optically controlled electron spins in ensembles of quantum dots (QDs) provide an attractive candidate to implement quantum information technologies in a solid-state environment. Electron spin coherence in an inhomogeneous ensemble of singly charged (In,Ga)As/GaAs QDs was studied by means of time-resolved techniques [1][2].
The inhomogeneity of the QDs allows us to address two different spin-ensembles, separated in energy. For the optical orientation of the spin-ensembles we use two synchronized pulsed Ti:Sapphire lasers, which have a well defined spectral detuning. The temporal evolution of the spin precession of the ensembles is measured by time-resolved Faraday-Rotation. Results are reported for a wide range of excitation parameters.
[1] A. Greilich, D. R. Yakovlev, A. Shabaev, Al. L. Efros, I. A. Yugova, R. Oulton, V. Stavarache, D. Reuter, A. Wieck, and M. Bayer, Science 313, 341 (2006)
[2] A. Greilich, A. Shabaev, D. R. Yakovlev, Al. L. Efros, I. A. Yugova, D. Reuter, A. D. Wieck and M. Bayer, Science 317, 1896 (2007)