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2 Acta Physica Polonica A

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Exciton Exchange between Nearly-Free and Acceptor-Bound States of a Positive Trion Assisted by Cyclotron Excitation

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Jadczak J. , Bryja L. , Wójs A. , Bartsch G. , Yakovlev D. , Bayer M. , Plochocka P. , Potemski M. , Reuter D. , Wieck A.

Acta Physica Polonica A

2011

tom 119

nr 5

600-601

In magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well we observe coupling of two different radiative states. The pair of coupled states are an acceptor-bound trion AX^{+} and an essentially free (only weakly localized by a shallow lateral potential) trion X^{+}, brought into resonance by an additional cyclotron excitation controlled by the magnetic field. The coupling mechanism is the exciton transfer, and the optical signature is a clear anticrossing of the emission lines of an X^{+} and a cyclotron replica of the AX^{+}.

Electron Spins in Self-Assembled (In,Ga)As/GaAs Quantum Dots Studied by Pump-Probe Faraday Rotation

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Greilich A. , Yugova I. , Oulton R. , Zhukov E. , Yakovlev D. , Bayer M. , Shabaev A. , Efros A. , Stavarache V. , Reuter D. , Wieck A.

Acta Physica Polonica A

2006

tom 110

nr 3

287-293

Static and dynamic properties of electron spins in self-assembled (In,Ga)As/GaAs quantum dots which contain on average a single electron per dot were studied by pump-probe Faraday rotation. Examples given here are the g-factor tensor components as well as the dephasing time T*_2 within a dot ensemble.