Pumping Current in a Quantum Dot by an Oscillating Magnetic Field

Abstract

We investigate spin and charge current through a quantum dot pumped by a time-varying magnetic field. Using the density matrix method, quantum rate equations for the electronic occupation numbers in the quantum dot are obtained and solved in the stationary state limit for a wide set of setup parameters. Both charge and spin current are expressed explicitly in terms of several relevant parameters and analyzed in detail. The results suggest a way of optimizing experimental setup parameters to obtain an maximal spin current without the charge current flow.

to appear in the proceedings of the international conference on frontiers in nonlinear and complex systems as a special issue in the International Journal of Modern Physics B, vol. 21,