D'yakonov-Perel' spin relaxation for degenerate electrons in the electron-hole liquid

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D'yakonov-Perel' spin relaxation for degenerate electrons in the electron-hole liquid

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/9992

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Title: D'yakonov-Perel' spin relaxation for degenerate electrons in the electron-hole liquid
Author: Mower, Matthew D.; Vignale, Giovanni, 1957-; Tokatly, I. V.
Date: 2010-10-27
Publisher: arXiv
Citation: arXiv:1010.5544v1
Abstract: We present an analytical study of the D'yakonov-Perel' spin relaxation time for degenerate electrons in a photo-excited electron-hole liquid in intrinsic semiconductors exhibiting a spin-split band structure. The D'yakonov-Perel' spin relaxation of electrons in these materials is controlled by electron-hole scattering, with small corrections from electron-electron scattering and virtually none from electron-impurity scattering. We derive simple expressions (one-dimensional and two- dimensional integrals respectively) for the effective electron-hole and electron-electron scattering rates which enter the spin relaxation time calculation. The electron-hole scattering rate is found to be comparable to the scattering rates from impurities in the electron liquid - a common model for n-type doped semiconductors. As the density of electron-hole pairs decreases (within the degenerate regime), a strong enhancement of the scattering rates and a corresponding slowing down of spin relaxation is predicted due to exchange and correlation effects in the electron-hole liquid. In the opposite limit of high density, the original D'yakonov-Perel' model fails due to decreasing scattering rates and is eventually superseded by free precession of individual quasiparticle spins.
URI: http://hdl.handle.net/10355/9992

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