Nonadiabatic Electron Pumping: Maximal Current with Minimal Noise

TL;DR

This paper investigates how non-adiabatic electron pumping in a double quantum dot can achieve maximum current with minimal noise, using analytical and numerical methods to optimize performance.

Contribution

It introduces an analytical approach to optimize current and noise in non-adiabatic electron pumps, validated by numerical Floquet transport theory.

Findings

Optimal working points occur near internal resonances.

Maximum current coincides with minimal noise.

Analytical expressions effectively predict pump performance.

Abstract

The noise properties of pump currents through an open double quantum dot setup with non-adiabatic 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.