Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot

Details Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot

2007-06-15

arxiv.org/abs/0706.2240v1

Phys. Rev. B 76, 115308 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 7 figures

Scientific paper

10.1103/PhysRevB.76.115308

Motivated by a recent experiment on nonlinear tunneling in a suspended Carbon nanotube connected to two normal electrodes [S. Sapmaz, {\it et al}., Phys. Rev. Lett. {\bf 96}, 26801 (2006)], we investigate nonequilibrium vibration-mediated sequential tunneling through a molecular quantum dot with two electronic orbitals asymmetrically coupled to two electrodes and strongly interacting with an internal vibrational mode, which is itself weakly coupled to a dissipative phonon bath. For this purpose, we establish rate equations using a generic quantum Langevin equation approach. Based on these equations, we study in detail the current-voltage characteristics and zero-frequency shot noise, paying special attention to the advanced or postponed of the appearance of negative differential conductance and super-Poissonian current noise resulting from electron-phonon-coupling induced {\em selective unidirectional cascades of single-electron transitions}.

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