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29 March 2024
 
  » arxiv » cond-mat/0512210

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Off-Fermi surface cancellation effects in spin-Hall conductivity of a two-dimensional Rashba electron gas
C. Grimaldi ; E. Cappelluti ; F. Marsiglio ;
Date 9 Dec 2005
Journal Phys. Rev. B vol.73, 081303(R) (2006)
Subject Mesoscopic Systems and Quantum Hall Effect
AbstractWe 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 $E_F /E_0$, where $E_F$ is the Fermi level and $E_0$ is the spin-orbit energy. We confirm earlier results indicating that in the limit $E_F/E_0 gg 1$ the vertex corrections suppress the spin-Hall conductivity. However, for sufficiently low electron density such that $E_Flesssim E_0$, we find that the vertex corrections no longer cancel contributions from the Fermi surface, and they cannot therefore suppress the spin current. This is instead achieved by contributions away from the Fermi surface, disregarded in earlier studies, which become large when $E_Flesssim E_0$.
Source arXiv, cond-mat/0512210
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