Spin Dynamics in (111) GaAs/AlGaAs Undoped Asymmetric Quantum Wells

The electron spin dynamics is investigated by the time-resolved Kerr rotation technique in a pair of special GaAs/AlGaAs asymmetric quantum well samples grown on (111)-oriented substrates, whose structures are the same except for their opposite directions of potential asymmetry. A large difference o...

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Bibliographic Details
Published in:Chinese physics letters 2012-09, Vol.29 (9), p.97204-1-097204-3
Main Authors: Wang, Gang, Ye, Hui-Qi, Shi, Zhen-Wu, Wang, Wen-Xin, Xavier, Marie, Andrea, Balocchi, Thierry, Amand, Liu, Bao-Li
Format: Article
Language:English
Subjects:
Aluminum gallium arsenides
Asymmetry
Cancellation
Deviation
Electron spin
Gallium arsenide
Gallium arsenides
Quantum wells
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Summary:The electron spin dynamics is investigated by the time-resolved Kerr rotation technique in a pair of special GaAs/AlGaAs asymmetric quantum well samples grown on (111)-oriented substrates, whose structures are the same except for their opposite directions of potential asymmetry. A large difference of spin lifetimes between the two samples is observed at low temperature. This difference is interpreted in terms of a cancellation effect between the Dresselhaus spin-splitting term in the conduction band and another term induced by interface inversion asymmetry. The deviation decreases with the increasing temperature, and almost disappears when T > 100 K because the cubic Dresselhaus term becomes more important.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/29/9/097204