Anomalous spin Hall effects in Dresselhaus (110) quantum wells
Journal
Physical Review B
Journal Volume
82
Journal Issue
15
Pages
155327
Date Issued
2010
Author(s)
Liu, Ming-Hao
Abstract
Anomalous spin Hall effects that belong to the intrinsic type in Dresselhaus (110) quantum wells are discussed. For the out-of-plane spin component, antisymmetric current-induced spin polarization induces opposite spin Hall accumulation, even though there is no spin-orbit force due to Dresselhaus (110) coupling. A surprising feature of this spin Hall induction is that the spin accumulation sign does not change upon bias reversal. Contribution to the spin Hall accumulation from the spin Hall induction and the spin deviation due to intrinsic spin-orbit force as well as extrinsic spin scattering can be straightforwardly distinguished simply by reversing the bias. For the in-plane component, inclusion of a weak Rashba coupling leads to a new type of ${S}_{y}$ intrinsic spin Hall effect solely due to spin-orbit-force-driven spin separation.
Type
journal article