Dynamical spin Hall conductivity in a magnetic disordered system
arXiv:1111.3575 · doi:10.1103/PhysRevB.84.245210
Abstract
We investigate the intrinsic spin Hall effect in a quantum well semiconductor doped with magnetic impurities, as a means to manipulate the carriers' spin. Using a simple Hamiltonian with Rashba spin-orbit coupling and exchange interactions, we analytically compute the spin Hall conductivity. It is demonstrated that using the appropriate order of limits, one recovers the intrinsic universal value. Numerical computations on a tight-binding model, in the weak disorder regime, confirm that the spin Hall effect is preserved in the presence of magnetic impurities. The optical spin conductivity shows large sample to sample fluctuations in the low frequency region. As a consequence, for weak disorder, the static spin conductivity is found to follow a wide Gaussian distribution with its mean value near the intrinsic clean value.
10 pages, 11 figures
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- Spin Hall Effect and Origins of Nonlocal Resistance in Adatom-Decorated Graphene
- Quantum Diagrammatic Theory of the Extrinsic Spin Hall Effect in Graphene
- Theory of electromagnetic wave propagation in ferromagnetic Rashba conductor
- Dynamical charge and pseudospin currents in graphene and possible Cooper pair formation
- Spin Hall Conductivity in the impure two-dimensional Rashba s-wave superconductor
- Enhanced spin Hall effect in strong magnetic disorder
- Many-body correction to the intrinsic anomalous and spin Hall conductivities