Abstract
The time of spin relaxation of excitons in (In,Al)As/AlAs quantum dots with an indirect bandgap and type-I band alignment is determined by measuring the dynamics of photoluminescence circular polarization induced by a magnetic field B. The spin relaxation time τ S increases with decreasing magnetic field in proportion to B −5; its value is ∼40 µs in a magnetic field of 6 T at a temperature of 1.8 K. As the temperature T increases in a magnetic field of 7 T, the value of τ S decreases as T −1.1. The character of the dependences of τ S on the magnetic field and temperature evidences that spin relaxation of excitons is provided by a process with participation of one acoustic phonon.
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Original Russian Text © T.S. Shamirzaev, D. Dunker, J. Debus, D.R. Yakovlev, K.S. Zhuravlev, M. Bayer, 2013, published in Avtometriya, 2013, Vol. 49, No. 5, pp. 112–118.
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Shamirzaev, T.S., Dunker, D., Debus, J. et al. Microsecond Lifetime of Exciton Spin Polarization in (In,Al)As/AlAs Quantum Dots. Optoelectron.Instrument.Proc. 49, 514–519 (2013). https://doi.org/10.3103/S8756699013050130
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DOI: https://doi.org/10.3103/S8756699013050130