# Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot - Condensed Matter > Mesoscale and Nanoscale Physics

Abstract: Motivated by a recent experiment on nonlinear tunneling in a suspended Carbonnanotube connected to two normal electrodes S. Sapmaz, {\it et al}., Phys.Rev. Lett. {\bf 96}, 26801 2006, we investigate nonequilibriumvibration-mediated sequential tunneling through a molecular quantum dot withtwo electronic orbitals asymmetrically coupled to two electrodes and stronglyinteracting with an internal vibrational mode, which is itself weakly coupledto a dissipative phonon bath. For this purpose, we establish rate equationsusing a generic quantum Langevin equation approach. Based on these equations,we study in detail the current-voltage characteristics and zero-frequency shotnoise, paying special attention to the advanced or postponed of the appearanceof negative differential conductance and super-Poissonian current noiseresulting from electron-phonon-coupling induced {\em selective unidirectionalcascades of single-electron transitions}.

Author: X. Y. Shen, Bing Dong, X. L. Lei, N. J. M. Horing

Source: https://arxiv.org/