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Spin-charge interconversion is currently the focus of intensive experimentaland theoretical research both for its intrinsic interest and for its potentialexploitation in the realization of new spintronic functionalities. Spin-orbitcoupling is one of the key microscopic mechanisms to couple charge currents andspin polarizations. The Rashba spin-orbit coupling in a two-dimensionalelectron gas has been shown to give rise to the inverse spin galvanic effect,i.e. the generation of a non-equilibrium spin polarization by a charge current.Whereas the Rashba model may be applied to the interpretation of experimentalresults in many cases, in general in a given real physical system spin-orbitcoupling also occurs due other mechanisms such as Dresselhaus bulk inversionasymmetry and scattering from impurities. In this work we consider the inversespin galvanic effect in the presence of Rashba, Dresselhaus and impurityspin-orbit scattering. We find that the size and form of the inverse spingalvanic effect is greatly modified by the presence of the various sources ofspin-orbit coupling. Indeed, spin-orbit coupling affects the spin relaxationtime by adding the Elliott-Yafet mechanism to the Dyakonov-Perel and,furthermore, it changes the non-equilibrium value of the current-induced spinpolarization by introducing a new spin generation torque. We use a diagrammaticKubo formula approach to evaluate the spin polarization-charge current responsefunction. We finally comment about the relevance of our results for theinterpretation of experimental results.

Inverse spin galvanic effect in the presence of impurity spin-orbit scattering: a diagrammatic approach