Spin pumping from Rashba spin-orbit-coupled electron systems driven by electric dipole spin resonance

This paper analyzes spin currents pumped from Rashba spin-orbit coupled two-dimentional electron systems in electric dipole spin resonance (EDSR). on the basis nonequilibrium Green's function formalism. In the ballistic transport regime, the EDSR-iduced spin pumping efficiently occurs for the finite-sized system smaller than the spin precession length. In the diffusive transport regie, the spin pumping is remarkably enhanced with increasing static disorder while the pumped spin dephases to a certain degree due to the D'yakonov-Perel' mechanism. The spin dephasing is controlled by reducing the system size compared with the precession length irrespective of the degree of disorder.