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29 March 2024
 
  » arxiv » cond-mat/0606366

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Role of degeneracy for current hysteresis (switching) of molecular junctions
A. S. Alexandrov ; A.M. Bratkovsky ;
Date 14 Jun 2006
AbstractCurrent-voltage (I-V) characteristics of nondegenerate and two-fold degenerate molecular quantum dots (MQD) are calculated by fully taking into account the electron-vibron and electron-electron correlations beyond a mean-field approximation in the non-adiabatic regime of weak coupling to the electrodes. The I-V characteristics exhibit phonon-side bands, but show no hysteretic behavior in contrast with mean-field theories. While most of the experimentally realized molecular junctions are in the non-adiabatic regime addressed in our formalism, we argue that hysteresis is absent at any coupling strength of non- or double-degenerate MQD with the electrodes. It could only appear in multiply degenerate MQDs with the degeneracy d>2 due to electron correlations.
Source arXiv, cond-mat/0606366
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