Inhaltszusammenfassung

We report on a comparative numerical study of the spin-Hall conductivity in two dimensions for three different spin-orbit interaction models; the standard k-linear rashba model, the k-cubic rashba model that describes two-dimensional hole systems, and a modified k-linear rashba model in which the spin-orbit coupling strength is energy dependent. numerical finite-size kubo formula results indicate that the spin-hall conductivity of the k-linear rashba model vanishes for frequency omega much sm...We report on a comparative numerical study of the spin-Hall conductivity in two dimensions for three different spin-orbit interaction models; the standard k-linear rashba model, the k-cubic rashba model that describes two-dimensional hole systems, and a modified k-linear rashba model in which the spin-orbit coupling strength is energy dependent. numerical finite-size kubo formula results indicate that the spin-hall conductivity of the k-linear rashba model vanishes for frequency omega much smaller than the scattering rate tau(-1), with first-order relative fluctuations surviving out to large system sizes. for the k-cubic rashba model case, the spin-hall conductivity does not depend noticeably on omega tau and is finite in the dc limit, in agreement with experiment. for the modified k-linear rashba model the spin-hall conductivity is noticeably omega tau dependent but approaches a finite value in the dc limit. we discuss these results in the light of a spectral decomposition of the spin-hall conductivity and associated sum rules, and in relation to a proposed separation of the spin-hall conductivity into skew-scattering, intrinsic, and interband vertex correction contributions.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
3.17 - Theoretische Chemie

DDC Sachgruppe:
Physik