Nonadiabatic electron pumping: maximal current with minimal noise.
The noise properties of pump currents through an open double-quantum-dot setup with nonadiabatic ac driving are investigated. Driving frequencies close to the internal resonances of the double-dot system mark the optimal working points at which the pump current assumes a maximum while its noise power possesses a remarkably low minimum. A rotating-wave approximation provides analytical expressions for the current and its noise power and allows to optimize the noise characteristics. The analytical results are compared to numerical results from a Floquet transport theory.
Strass
Michael
M
Institut für Physik, Universität Augsburg, Germany.
Hänggi
Peter
P
Kohler
Sigmund
S