Robust negative differential conductance and enhanced shot noise in transport through a molecular transistor with vibration assistance
Mesoscale and Nanoscale Physics
2016-11-17 v1
Abstract
In this paper, we analyze vibration-assisted sequential tunneling (including current-voltage characteristics and zero-frequency shot noise) through a molecular quantum dot with two electronic orbitals asymmetrically coupled to the internal vibration. We employ rate equations for the case of equilibrated phonons, and strong Coulomb blockade. We find that a system with a strongly phonon-coupled ground state orbital and weakly phonon-coupled excited state orbital exhibits strong negative differential conductance; and it also shows super-Poissonian current noise. We discuss in detail the reasons and conditions for the appearance of negative differential conductance.
Keywords
Cite
@article{arxiv.0802.2768,
title = {Robust negative differential conductance and enhanced shot noise in transport through a molecular transistor with vibration assistance},
author = {Bing Dong and X. L. Lei and N. J. M. Horing},
journal= {arXiv preprint arXiv:0802.2768},
year = {2016}
}
Comments
6 pages, 6 figures, and 1 table