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

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