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Electron Spin Beats in InGaAs/GaAs Quantum Dots

Kalevich V.K.¹, Tkachuk M.N.¹, Le Jeune P.², Marie X.², Amand T.²

¹A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia Ioffe Institute, St. Petersburg, Russia

²Laboratoire de Physique de la Mati`ere Condensee CNRS-UMR INSA, Complexe scientifique de Rangueil, Toulouse cedex, France

Email: kalevich@solid.ioffe.rssi.ru

Выставление онлайн: 19 апреля 1999 г.

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Time resolved picosecond spectroscopy is used for the first time to study optical orientation and spin dynamics of carriers in self-organized In(Ga)As/GaAs quantum dots (QDs) arrays. Optical orientation of carriers created by 1.2 ps light pulses both in the GaAs matrix and wetting layer and captured by QDs is found to last a few hundreds of picosecond. The saturation of electron ground state at high excitation light intensity leads to electron polarization in excited states close to 100% and to its vanishing in ground state. Electron spin quantum beats in a transverse magnetic field are observed for the first time in semiconductor QDs. We thus determine the quasi-zero-dimensional electron g-factor in In_0.5Ga_0.5As/GaAs QDs to be: |g_normal|=0.27± 0.03.

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