Optical orientation of Mn2+ ions in GaAs in weak longitudinal magnetic fields |
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Authors: | Akimov I A Dzhioev R I Korenev V L Kusrayev Yu G Sapega V F Yakovlev D R Bayer M |
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Institution: | Experimentelle Physik 2, Technische Universit?t Dortmund, 44221 Dortmund, Germany. |
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Abstract: | We report on optical orientation of Mn2+ ions in bulk GaAs subject to weak longitudinal magnetic fields (B≤100 mT). A manganese spin polarization of 25% is directly evaluated by using spin-flip Raman scattering. The dynamical Mn2+ polarization occurs due to the s-d exchange interaction with optically oriented conduction band electrons. Time-resolved photoluminescence reveals a nontrivial electron spin dynamics, where the oriented Mn2+ ions tend to stabilize the electron spins. |
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