Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-08
Physical Review B, Volume 77, 165403 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures, 1 table. v2: new discussion of conductance as a function of molecular stretching, including new Fig. 3; ex
Scientific paper
10.1103/PhysRevB.77.165403
We investigate electrical conduction through individual oligopeptide molecules thiol-bonded between gold nanocontacts using ab initio and semi-empirical techniques. Our theory explains for the first time these molecules' experimentally observed current-voltage characteristics, including both the magnitude and rectification of the current, and uses no adjustable parameters. We identify the mechanism of the observed current rectification, and predict that it will result in negative differential resistance at moderate biases. Our findings open the way to the realization of protein-based nanoelectronic devices.
Cardamone David M.
Kirczenow} George
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