title: Spin-Hall effect in two-dimensional electron systems with Rashba spin-orbit coupling and disorder.
abstract: Using the four-terminal Landauer-Bu ttiker formula and Green's function approach, we calculate numerically the spin-Hall conductance in a two-dimensional junction system with the Rashba spin-orbit (SO) coupling and disorder. We find that the spin-Hall conductance can be much greater or smaller than the universal value e/8pi, depending on the magnitude of the SO coupling, the electron Fermi energy, and the disorder strength. The spin-Hall conductance does not vanish with increasing sample size for a wide range of disorder strength. Our numerical calculation reveals that a nonzero SO coupling can induce electron delocalization for disorder strength smaller than a critical value, and the nonvanishing spin-Hall effect appears mainly in the metallic regime.
authors.affiliation: Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA.
authors.forename: L
authors.initials: L
authors.lastname: Sheng
authors.forename: D N
authors.initials: DN
authors.lastname: Sheng
authors.forename: C S
authors.initials: CS
authors.lastname: Ting