Relaxation mechanisms of the persistent spin helix

Luffe, M. C.; Kailasvuori, J.; Nunner, T. S.

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Relaxation mechanisms of the persistent spin helix

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Kailasvuori, J.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Luffe, M. C., Kailasvuori, J., & Nunner, T. S. (2011). Relaxation mechanisms of the persistent spin helix. Physical Review B, 84(7): 075326.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8C53-C

Abstract

We study the lifetime of the persistent spin helix in semiconductor quantum wells with equal Rashba and linear Dresselhaus spin-orbit coupling strengths. In order to address the temperature dependence of the relevant spin relaxation mechanisms we derive and solve a semiclassical spin diffusion equation taking into account the effects of spin-dependent impurity scattering, cubic Dresselhaus spin-orbit coupling and electron-electron interactions. For the experimentally relevant regime we find that the lifetime of the persistent spin helix is mainly determined by the interplay of cubic Dresselhaus spin-orbit interaction and electron-electron interactions. We propose that even longer lifetimes can be achieved by generating a spatially damped spin profile instead of the persistent spin helix state.