Spin Hall effect due to intersubband-induced spin-orbit interaction in symmetric quantum wells

Abstract

We investigate the intrinsic spin Hall effect in two-dimensional electron gases in quantum wells with two subbands, where a new intersubband-induced spin-orbit coupling is operative. The bulk spin Hall conductivity ${\sigma }_{xy}^z$ is calculated in the ballistic limit within the standard Kubo formalism in the presence of a magnetic field $B$ and is found to remain finite in the B=0 limit, as long as only the lowest subband is occupied. Our calculated ${\sigma }_{xy}^z$ exhibits a nonmonotonic behavior and can change its sign as the Fermi energy (the carrier areal density $n_{2D}$) is varied between the subband edges. We determine the magnitude of ${\sigma }_{xy}^z$ for realistic InSb quantum wells by performing a self-consistent calculation of the intersubband-induced spin-orbit coupling.

7 pages, 3 figures

References in corpus (16)

• Dissipationless Quantum Spin Current at Room Temperature
• Spin current and polarization in impure 2D electron systems with spin-orbit coupling
• SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors
• Can Non-Equilibrium Spin Hall Accumulation be Induced in Ballistic Nanostructures?
• Spin-Hall effect in a disordered 2D electron-system
• Resonant Spin Hall Conductance in Two-Dimensional Electron Systems with Rashba Interaction in a Perpendicular Magnetic Field
• Spin-Hall transport of heavy holes in III-V semiconductor quantum wells
• Mesoscopic Spin Hall Effect in Multiprobe Ballistic Spin-Orbit Coupled Semiconductor Bridges
• Intersubband-induced spin-orbit interaction in quantum wells
• Spin Hall Current Driven by Quantum Interferences in Mesoscopic Rashba Rings
• Spin Hall effect of conserved current: Conditions for a nonzero spin Hall current
• Spin susceptibilities, spin densities and their connection to spin-currents
• Spin Accumulation and Equilibrium Currents at the Edge of 2DEGs with Spin-Orbit Coupling
• Resonant spin Hall conductance in quantum Hall systems lacking bulk and structural inversion symmetry
• Spin polarizations and spin Hall currents in a two-dimensional electron gas with magnetic impurities
• Spin accumulation in ballistic Rashba bar