The influence of inelastic relaxation time on intrinsic spin Hall effects in a disordered two-dimensional electron gas
نویسندگان
چکیده
The influence of inelastic relaxation time on the intrinsic spin Hall effects in a disordered two-dimensional electron gas with Rashba interaction is studied; we clarify the controversy as regards impurity effects in the system. We reveal that, due to the existence of inelastic scattering, the spin Hall conductivity does not vanish when the impurity concentration diminishes to zero, regardless of nonmagnetic or magnetic disorder. The spin accumulation is evaluated by using the spin Hall conductivity obtained, and an alternative route is suggested for verifying the intrinsic spin Hall effect by measuring the spin accumulation at different ratios.
منابع مشابه
Interplay of intrinsic and extrinsic mechanisms to the spin Hall effect in a two-dimensional electron gas
In order to describe correctly the interplay of extrinsic and intrinsic spin-orbit mechanisms to the spin Hall effect, it is necessary to consider different sources of spin relaxation. We take into account the spin relaxation time τDP due to the Dyakonov-Perel mechanism as well as the Elliot-Yafet spin-relaxation time τs due to the spin-orbit scattering from impurities. The total spin Hall cond...
متن کاملInverse spin Hall effect and anomalous Hall effect in a two-dimensional electron gas
We study the coupled dynamics of spin and charge currents in a two-dimensional electron gas in the transport diffusive regime. For systems with inversion symmetry there are established relations between the spin Hall effect, the anomalous Hall effect and the inverse spin Hall effect. However, in two-dimensional electron gases of semiconductors like GaAs, inversion symmetry is broken so that the...
متن کاملSpin-charge coupling effects in a two-dimensional electron gas
In these lecture notes we study the disordered two-dimensional electron gas in the presence of Rashba spin-orbit coupling, by using the Keldysh nonequilibrium Green function technique. We describe the effects of the spin-orbit coupling in terms of a SU(2) gauge field and derive a generalized Boltzmann equation for the charge and spin distribution functions. We then apply the formalism to discus...
متن کاملAccumulation of opposite spins on the transverse edges of a two-dimensional electron gas in a longitudinal electric field
We show that the spin-orbit interaction induced by the boundary-confining potential causes opposite spin accumulations on the transverse edges in a zonal two-dimensional electron gas in the presence of an external longitudinal electric field. While the bias is reversed, the spin-polarized direction is also reversed. The intensity of the spin accumulation is proportional to the bias voltage. In ...
متن کاملشبیه سازی اثر بی نظمی و میدان مغناطیسی بر ترابرد کوانتومی نانوساختارهای دو بعدی مدل شده با تقریب تنگابست
In recent years, semiconductor nanostructures have become the model systems of choice for investigation of electrical conduction on short length scales. Quantum transport is studied in a two dimensional electron gas because of the combination of a large Fermi wavelength and large mean free path. In the present work, a numerical method is implemented in order to contribute to the understanding ...
متن کامل