Phonon effects on the current noise spectra and the ac conductance of a single molecular junction
arXiv:1312.4216 · doi:10.1088/0953-8984/26/30/305301
Abstract
By using nonequilibrium Green's functions and the equation of motion method, we formulate a self-consistent field theory for the electron transport through a single molecular junction (SMJ) coupled with a vibrational mode. We show that the nonequilibrium dynamics of the phonons in strong electron-phonon coupling regime can be taken into account appropriately in this self-consistent perturbation theory, and the self-energy of phonons is connected with the current fluctuations in the molecular junction. We calculate the finite-frequency nonsymmetrized noise spectra and the ac conductance, which reveal a wealth of inelastic electron tunneling characteristics on the absorption and emission properties of this SMJ. In the presence of a finite bias voltage and the electron tunneling current, the vibration mode of the molecular junction is heated and driven to an unequilibrated state. The influences of unequilibrated phonons on the current and the noise spectra are investigated.
12 pages, 8 figures
References in corpus (18)
- Molecular Transport Junctions: Vibrational Effects
- Franck-Condon blockade and giant Fano factors in transport through single molecules
- Strong coupling between single-electron tunneling and nano-mechanical motion
- Franck-Condon blockade in suspended carbon nanotube quantum dots
- Vibrational sidebands and dissipative tunneling in molecular transistors
- Theory of the Franck-Condon blockade regime
- Tunneling in suspended carbon nanotubes assisted by longitudinal phonons
- Inelastic tunneling effects on noise properties of molecular junctions
- Phonon-assisted current noise in molecular junctions
- Quantum Interference and Decoherence in Single-Molecule Junctions: How Vibrations Induce Electrical Current
- Electron-phonon interaction and full counting statistics in molecular junctions
- Vibration-induced correction to the current through a single molecule
- Charge transfer statistics of a molecular quantum dot with a vibrational degree of freedom
- Charge transfer statistics of a molecular quantum dot with strong electron-phonon interaction
- Quantum dot admittance probed at microwave frequencies with an on-chip resonator
- Nonlinear effects of phonon fluctuations on transport through nanoscale junctions
- Current noise in molecular junctions: effects of the electron-phonon interaction
- Inelastic shot noise characteristics of nanoscale junctions from first principles