Photon-phonon-assisted thermoelectric effects in the molecular devices

Abstract

We consider a single level quantum dot interacting with a phonon mode and weakly coupled to metallic leads which are subjected to a time dependent gate voltage. Electrical conductance, thermopower, and figure of merit are investigated in detail using a Tien-Gordon-type rate equation. In the presence of the microwave field, the electrical conductance exhibits extra peaks whose height is controlled by the magnitude of the microwave field. Furthermore, the oscillation of the thermopower increases in the presence of the time-dependent gate voltage or the electron-phonon interaction. Influence of the electron-phonon interaction, microwave field, temperature, and Coulomb interaction on the figure of merit is also studied.

14 pages, 4 figures

References in corpus (13)

• Quantized thermal conductance of dielectric quantum wires
• Single-mode heat conduction by photons
• Resonant inelastic tunneling in molecular junctions
• Violation of the Wiedemann-Franz Law in a Single-Electron Transistor
• Inelastic current-voltage characteristics of atomic and molecular junctions
• Nonequilibrium dynamics of the Holstein polaron driven by external electric field
• Thermoelectric transport with electron-phonon coupling and electron-electron interaction in molecular junctions
• Charge transfer statistics of a molecular quantum dot with strong electron-phonon interaction
• Phonon runaway in nanotube quantum dots
• Nonequilibrium isolated molecule limit
• Photon-Phonon-assisted tunneling through a single-molecular quantum dot
• Transient heat generation in a quantum dot under a step-like pulse bias
• Signatures of exchange correlations in the thermopower of quantum dots