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- W2318962728 abstract "We show experimentally, using spin quantum beat spectroscopy, that strain applied to an undoped symmetric (001) GaAs/AlGaAs multiple quantum well causes an in-plane anisotropy of the spin-relaxation rate ${ensuremath{Gamma}}^{s}$, but leaves the electron Land'e $g$ factor isotropic. The spin-relaxation-rate anisotropy gives a direct measure of the bulk inversion asymmetry and the strain contributions to the conduction-band spin splitting. The comparison of the measured strain-splitting coefficient ${C}_{3}$ for the quantum well with the value for bulk GaAs suggests a dependence on electron quantum confinement. The isotropic $g$ factor implies a symmetric conduction electron wave function, whereas the anisotropic spin-relaxation rate requires a nonzero expectation value of the valence-band potential gradient on the conduction-band states. Therefore, the experiment suggests that strain generates an effective valence-band potential gradient, while the conduction-band potential remains symmetrical to a good approximation." @default.
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- W2318962728 date "2011-10-31" @default.
- W2318962728 modified "2023-09-27" @default.
- W2318962728 title "Strain-induced spin relaxation anisotropy in symmetric (001)-oriented GaAs quantum wells" @default.
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- W2318962728 doi "https://doi.org/10.1103/physrevb.84.155323" @default.
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