Abstract
Low symmetry of two-dimensional (2D) semiconductor systems results in a dependence of the spin relaxation times on the spin orientation relative to crystallographic directions. It is demonstrated that a microscopic reason for this anisotropy is an interference of structure inversion asymmetry (SIA) and bulk inversion asymmetry (BIA). For the D'yakonov–Perel' spin relaxation mechanism the anisotropy is due to SIA and BIA interference in the spin splitting of energy spectrum. In the case of the Elliott–Yafet mechanism the spin relaxation anisotropy is caused by the interference of SIA and BIA in the spin-flip scattering probability.
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