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Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction
preprint
posted on 2006-04-03, 15:49 authored by A.S. Alexandrov, A.M. BratkovskyTheory 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.
History
School
- Science
Department
- Physics
Pages
195540 bytesPublication date
2002Notes
This is a pre-print. It is also available at: http://arxiv.org/abs/cond-mat/0212424.Language
- en