Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction
Mesoscale and Nanoscale Physics
2009-11-07 v1 Materials Science
Statistical Mechanics
Abstract
Theory of current hysteresis for tunneling through a molecular quantum dot (MQD) with strong electron-vibron interactions and attractive electron-electron correlations is developed. The dot is modeled as a d-fold degenerate energy level weakly coupled to the leads. The effective attractive interaction between polarons in the dot results in a "switching" phenomenon in the current-voltage characteristics when d>2, in agreement with the results for the phenomenological negative-U model. The degenerate MQD with strong electron-vibron coupling has two stable current states in certain interval of the bias voltage below some critical temperature.
Cite
@article{arxiv.cond-mat/0212424,
title = {Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction},
author = {A. S. Alexandrov and A. M. Bratkovsky},
journal= {arXiv preprint arXiv:cond-mat/0212424},
year = {2009}
}
Comments
8 pages, 4 figures