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Temperature and Electron Density Dependence of Spin Relaxation in GaAs/AlGaAs Quantum Well

Temperature and carrier density dependent spin dynamics for GaAs/AlGaAs quantum wells (QWs) with different structural symmetry has been studied by using time-resolved Kerr rotation technique. The spin relaxation time is measured to be much longer for the symmetrically-designed GaAs quantum well comparing with the asymmetrical one, indicating the strong influence of Rashba spin-orbit coupling on spin relaxation. D'yakonov-Perel' (DP) mechanism has been revealed to be the dominant contribution for spin relaxation in GaAs/AlGaAs QWs. The spin relaxation time exhibits non-monotonic dependent behavior on both temperature and photo-excited carrier density, revealing the important role of non-monotonic temperature and density dependence of electron-electron Coulomb scattering. Our experimental observations demonstrate good agreement with recently developed spin relaxation theory based on microscopic kinetic spin Bloch equation approach.

preprint2010arXivOpen access
L. F. HanY. G. ZhuX. H. ZhangP. H. TanH. Q. NiZ. C. Niu
cond-mat.mes-hall
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L. F. HanY. G. ZhuX. H. ZhangP. H. TanH. Q. NiZ. C. Niu

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