We calculate the spin-Hall conductivity of a disordered two-dimensional Rashba electron gas within the self-consistent Born approximation and for arbitrary values of the electron density, parametrized by the ratio EF /E0, where EF is the Fermi level and E0 is the spin-orbit energy. We confirm earlier results indicating that in the limit EF /E0 ≫ 1 the vertex corrections suppress the spin-Hall conductivity. However, for sufficiently low electron density such that EF E0, we find that the vertex corrections no l…
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