Magnetization transfer by a quantum ring device

Abstract

We show that a tight-binding model device consisting of a laterally connected ring at half filling in a tangent time-dependent magnetic field can in principle be designed to pump a purely spin current. The process exploits the spin-orbit interaction in the ring. This behavior is understood analytically and found to be robust with respect to temperature and small deviations from half filling. © 2014 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.