ID: cond-mat/0411193

A spin pump turnstile: parametric pumping of a spin-polarized current through a nearly-closed quantum dot

November 8, 2004

View on ArXiv
M. Blaauboer, C. M. L. Fricot
Condensed Matter
Mesoscale and Nanoscale Phys...

We investigate parametric pumping of a spin-polarized current through a nearly-closed quantum dot in a perpendicular magnetic field. Pumping is achieved by tuning the tunnel couplings to the left and right lead - thereby operating the quantum dot as a turnstile - and changing either the magnetic field or a gate-voltage. We analyze the quantum dynamics of a pumping cycle and the limiting time scales for operating the quantum dot turnstile as a pure spin pump. The proposed device can be used as a fully controllable double-sided and bipolar spin filter and to inject spins "on demand".

Similar papers 1