Spin Dynamics in (111) GaAs/AlGaAs Undoped Asymmetric Quantum Wells
WANG Gang1 , YE Hui-Qi1 , SHI Zhen-Wu1 , WANG Wen-Xin1 , MARIE Xavier2** , BALOCCHI Andrea2 , AMAND Thierry2 , LIU Bao-Li1**
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2 Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 avenue de Rangueil, 31077 Toulouse, France
Abstract ：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.
收稿日期: 2012-05-15
出版日期: 2012-10-01
:
72.25.Rb
(Spin relaxation and scattering)
72.25.Fe
(Optical creation of spin polarized carriers)
73.21.Fg
(Quantum wells)
引用本文:
. [J]. 中国物理快报, 2012, 29(9): 97204-097204.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/29/9/097204
或
https://cpl.iphy.ac.cn/CN/Y2012/V29/I9/97204
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2012, Vol. 29 
