Floquet nonequilibrium Green's functions with fluctuation-exchange approximation: Application to periodically driven capacitively coupled quantum dots

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. An optimal frequency, resulting in a maximum time-averaged energy current through the system, was identified and explained with the completion of a four-stage process.