Electron Spin Dynamics in Semiconductors without Inversion Symmetry

Details Electron Spin Dynamics in Semiconductors without Inversion Symmetry Electron Spin Dynamics in Semiconductors without Inversion Symmetry

2002-08-13

arxiv.org/abs/cond-mat/0208261v1

Physics

Condensed Matter

to appear in Proceedings of Mesoscopic Superconductivity and Spintronics (MS+S2002)

Scientific paper

We present a microscopic analysis of electron spin dynamics in the presence of an external magnetic field for non-centrosymmetric semiconductors in which the D'yakonov-Perel' spin-orbit interaction is the dominant spin relaxation mechanism. We implement a fully microscopic two-step calculation, in which the relaxation of orbital motion due to electron-bath coupling is the first step and spin relaxation due to spin-orbit coupling is the second step. On this basis, we derive a set of Bloch equations for spin with the relaxation times T_1 and T_2 obtained microscopically. We show that in bulk semiconductors without magnetic field, T_1 = T_2, whereas for a quantum well with a magnetic field applied along the growth direction T_1 = T_2/2 for any magnetic field strength.

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