Spin Hall Effect in Symmetric Wells with Two Subbands

Original Paper

Abstract

We investigate the spin Hall conductivity σxyz of a clean 2D electron gas formed in a two-subband well. We determine σxyz as arising from the inter-subband induced spin–orbit (SO) coupling η (Calsaverini et al., Phys. Rev. B 78:155313, 2008) via a linear-response approach due to Rashba. By self-consistently calculating η for realistic wells, we find that σxyz presents a non-monotonic (and non-universal) behavior and a sign change as the Fermi energy varies between the subband edges. Although our σxyz is very small (i.e., ≪``e/4π″), it is non-zero as opposed to linear-in-k SO models.

Keywords

Spin Hall conductivity Two-subband quantum wells Inter-subband spin-orbit interaction 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil
  2. 2.Department of Applied PhysicsKyung Hee UniversityYonginKorea
  3. 3.Department of PhysicsUniversity of BaselBaselSwitzerland

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