Floquet Nonequilibrium Green's functions with Fluctuation-Exchange Approximation: Application to Periodically Driven Capacitively Coupled Quantum Dots

TL;DR

This paper investigates energy transfer in periodically driven capacitively coupled quantum dots using Floquet Green's functions and fluctuation-exchange approximation, revealing a four-stage process sensitive to driving frequency.

Contribution

It introduces a Floquet Green's function approach combined with fluctuation-exchange approximation to analyze energy transfer in driven quantum dot systems, highlighting a four-stage transfer mechanism.

Findings

Energy transfer occurs via a four-stage process.

Energy transfer efficiency depends on the driving frequency.

Optimal frequency maximizes energy transfer completion.

Abstract

We study the dynamics of two capacitively coupled quantum dots, each coupled to a lead. A Floquet Green's function approach described the system's dynamics, with the electron-electron interactions handled with the fluctuation-exchange approximation. While electrons cannot move between the separate sections of the device, energy transfer occurs with the periodic driving of one of the leads. This process was found to be explained with four stages. The energy transfer was also found to be sensitive to the driving frequency of the leads, with an optimal frequency corresponding to the optimal completion of the four stages of the identified process.