Photon-phonon-assisted tunneling through a double quantum dot molecule

We investigate photon-phonon-assisted tunneling through a double quantum dot molecule using a well-established non-equilibrium Green function technique. The molecule is sandwiched between two ideal electrodes and the electron at each dot of the molecule interacts independently with Einstein phonons. The many-body problem of electron-phonon interactions is mapped onto a multichannel one-body problem. Together with these resonant peaks of the two-level system, additional satellite peaks due to the photon absorption (emission) process and/or phonon-assisted tunneling are observed in the transmission spectrum. Furthermore, the time-average current and differential conductance are calculated. The feasibility of manipulating the phonon-assisted tunneling with photon absorption (emission) processes by the voltage bias is also discussed