Effects of time-varying couplings to the heat baths and time-dependent electron-phonon interactions to the transport of electrons in a nanoscale device

Abstract

We study the nonequilibrium electron transport through a nanoscale junction with time-varying couplings to the heat baths and time-dependent electron-phonon interaction in the central region. We use time-dependent nonequilibrium Green’s functions to express the current flowing through the nanoscale device. We find that varying the couplings to the heat baths while keeping the electron-phonon interaction steady can not affect the current once it reaches steady state. We also incorporate time-dependent electron-phonon interaction at the channel to model varying lattice structure and observe its effect on the current.