Effect of electron-electron scattering on spin dephasing in a high-mobility low-density twodimensional electron gas

Abstract

Utilizing time-resolved Kerr rotation techniques, we have investigated the spin dynamics of a high mobility, low density two dimensional electron gas in a GaAs/Al0:35Ga0:65As heterostructure in dependence on temperature from 1.5 K to 30 K. It is found that the spin relaxation/dephasing time under a magnetic field of 0.5 T exhibits a maximum of 3.12 ns around 14 K, superimposed on an increasing background with rising temperature. The appearance of the maximum is ascribed to that at the temperature where the crossover from the degenerate to the nondegenerate regime takes place, electron-electron Coulomb scattering becomes strongest, and thus inhomogeneous precession broadening due to D'yakonov-Perel'(DP) mechanism becomes weakest. These results agree with the recent theoretical predictions [Zhou et al., PRB 75, 045305 (2007)], verifying the importance of electron-electron Coulomb scattering to electron spin relaxation/dephasing.

4 pages, 2 figures

References in corpus (3)

• High temperature spin dephasing in n-typed GaAs quantum wells
• Effect of initial spin polarization on spin dephasing and electron g factor in a high-mobility two-dimensional electron system
• Spin relaxation in $n$-type GaAs quantum wells from a full microscopic approach

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