Photon-Phonon-assisted tunneling through a single-molecular quantum dot

Details Photon-Phonon-assisted tunneling through a single-molecular quantum dot Photon-Phonon-assisted tunneling through a single-molecular quantum dot

2004-02-27

arxiv.org/abs/cond-mat/0402684v2

Phys. Rev. B 69, 205315 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures, submitted to Phys. Rev. B. accepted by Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.205315

Based on exactly mapping of a many-body electron-phonon interaction problem onto a one-body problem, we apply the well-established nonequilibrium Green function technique to solve the time-dependent phonon-assisted tunneling at low temperature through a single-molecular quantum dot connected to two leads, which is subject to a microwave irradiation field. It is found that in the presence of the electron-phonon interaction and the microwave irradiation field, the time-average transmission and the nonlinear differential conductance display additional peaks due to pure photon absorption or emission processes and photon-absorption-assisted phonon emission processes. The variation of the time-average current with frequency of the microwave irradiation field is also studied.

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