Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot
Abstract
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}.
Cite
@article{arxiv.0706.2240,
title = {Vibration-mediated resonant tunneling and shot noise through a molecular quantum dot},
author = {X. Y. Shen and Bing Dong and X. L. Lei and N. J. M. Horing},
journal= {arXiv preprint arXiv:0706.2240},
year = {2009}
}