Influence of microwave fields on the electron transport through a quantum dot in the presence of a direct tunneling between leads

TL;DR

This paper investigates how microwave fields affect electron transport through a quantum dot with direct lead tunneling, providing analytical formulas and analyzing the impact on charge and current in various conditions.

Contribution

It introduces an analytical approach to study microwave influence on quantum dot transport with direct tunneling, expanding understanding of dynamic electron behavior.

Findings

Microwave fields alter the average charge and current in the quantum dot.

Analytical formulas describe the time-dependent charge and current.

The study covers a wide range of parameters, revealing diverse effects.

Abstract

We consider the time-dependent electron transport through a quantum dot coupled to two leads in the presence of the additional over-dot (bridge) tunneling channel. By using the evolution operator method together with the wide-band limit approximation we derived the analytical formulaes for the quantum dot charge and current flowing in the system. The influence of the external microwave field on the time-average quantum dot charge, the current and the derivatives of the average current with respect to the gate and source-drain voltages has been investigated for a wide range of parameters.