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arXiv · 1301.1662

Evolution of the persistent spin helix in the presence of Hartree-Fock fields

Matthias C. Lüffe·Jeroen Danon·Tamara S. Nunner
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Abstract

We derive a spin diffusion equation for a spin-orbit coupled two-dimensional electron gas including the Hartree-Fock field resulting from 1st order electron-electron interactions. We find that the lifetime of the persistent spin helix, which emerges for equal linear Rashba- and Dresselhaus spin-orbit interactions, can be enhanced considerably for large initial spin polarizations due to the Hartree-Fock field. The reason is a reduction of the symmetry-breaking cubic Dresselhaus scattering rate by the Hartree-Fock field. Also higher harmonics are generated and the polarization of the persistent spin helix rotates out of the (Sy,Sz)-plane acquiring a finite Sx-component. This effect becomes more pronounced, when the cubic Dresselhaus spin-orbit interaction is large.

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Matthias C. Lüffe, Jeroen Danon, Tamara S. Nunner. 2013-01-08. Evolution of the persistent spin helix in the presence of Hartree-Fock fields. https://doi.org/10.1103/physrevb.87.125416

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