Single-parameter spin-pumping in driven metallic rings with spin-orbit   coupling
  We consider the generation of a pure spin-current at zero bias voltage with a single time-dependent potential. To such end we study a device made of a mesoscopic ring connected to electrodes and clarify the interplay between a magnetic flux, spin-orbit coupling and non-adiabatic driving in the production of a spin and electrical current. By using Floquet theory, we show that the generated spin to charge current ratio can be controlled by tuning the spin-orbit coupling. 
J. P. Ramos, L. E. F. Foa Torres, P. A. Orellana, V. M. Apel
cond-mat.mes-hall