| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 avenue de Rangueil, 31077 Toulouse, France |
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| Cite this article: |
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WANG Gang, YE Hui-Qi, SHI Zhen-Wu et al 2012 Chin. Phys. Lett. 29 097204 |
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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.
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Received: 15 May 2012
Published: 01 October 2012
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| PACS: |
72.25.Rb
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(Spin relaxation and scattering)
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72.25.Fe
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(Optical creation of spin polarized carriers)
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73.21.Fg
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(Quantum wells)
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