bi-stable_2002.pdf (143.5 kB)
Bi-stable tunneling current through a molecular quantum dot
preprint
posted on 2006-04-03, 12:08 authored by A.S. Alexandrov, A.M. Bratkovsky, R.S. WilliamsAn exact solution is presented for tunneling through a negative-U d-fold degenerate molecular quantum dot weakly coupled to electrical leads. The tunnel current exhibits hysteresis if the level degeneracy of the negative-U dot is larger than two (d>2). Switching occurs in the voltage range V1 < V < V2 as a result of attractive electron correlations in the molecule, which open up a new conducting channel when the voltage is above the threshold bias voltage V2. Once this current has been established, the extra channel remains open as the voltage is reduced down to the lower threshold voltage V1. Possible realizations of the bi-stable molecular quantum dots are fullerenes, especially C60, and mixed-valence compounds.
History
School
- Science
Department
- Physics
Pages
120546 bytesPublication date
2002Notes
This is a pre-print. It is available at: http://arxiv.org/abs/cond-mat/0204387. The definitive version of this article, ALEXANDROV, A.S., BRATKOVSKY, A.M. and WILLIAMS, R.S., 2003. Bi-stable tunneling current through a molecular quantum dot, Physics Review B, 67, 075301, is available at: http://prb.aps.org/Language
- en