Phys. Rev. B 77, 193302 (2008) [4 pages]Spin Hall effect in a symmetric quantum well by a random Rashba fieldReceived 12 December 2007; revised 20 February 2008; published 5 May 2008 Dopant ion concentrations in the sides of a symmetric quantum well are known to create a random Rashba-type spin-orbit coupling. Here, we demonstrate that, as a consequence, a finite size spin Hall effect is also present. Our numerical algorithm estimates the result of the Kubo formula for the spin Hall conductivity by using a tight-binding approximation of the Hamiltonian in the framework of a time-dependent Green’s function formalism well suited for very large systems. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.193302
DOI:
10.1103/PhysRevB.77.193302
PACS:
73.21.Fg, 71.70.Ej, 73.63.Hs, 85.75.−d
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