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Anisotropic in-plane spin splitting in an asymmetric (001) GaAs/AlGaAs quantum well

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Author(s): Ye Huiqi | Hu Changcheng | Wang Gang | Zhao Hongming | Tian Haitao | Zhang Xiuwen | Wang Wenxin | Liu Baoli

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 6;
Issue: 1;
Start page: 520;
Date: 2011;
Original page

Keywords: quantum beats | spin-orbit coupling | magnetic properties of nanostructures | optical creation of spin polarized

ABSTRACT
Abstract The in-plane spin splitting of conduction-band electron has been investigated in an asymmetric (001) GaAs/Al x Ga1-x As quantum well by time-resolved Kerr rotation technique under a transverse magnetic field. The distinctive anisotropy of the spin splitting was observed while the temperature is below approximately 200 K. This anisotropy emerges from the combined effect of Dresselhaus spin-orbit coupling plus asymmetric potential gradients. We also exploit the temperature dependence of spin-splitting energy. Both the anisotropy of spin splitting and the in-plane effective g-factor decrease with increasing temperature. PACS: 78.47.jm, 71.70.Ej, 75.75.+a, 72.25.Fe,
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