Nonequilibrium charge-Kondo transport through negative-U molecules
Abstract
Low-temperature transport through molecules with effectively negative charging energy U exhibits a charge-Kondo effect. We explore this regime analytically by establishing an exact mapping between the negative-U and the positive-U Anderson models, which is suitable for the description of nonequilibrium transport. We employ this mapping to demonstrate the intimate relation between nonequilibrium tranport in the spin-Kondo and charge-Kondo regimes, and derive analytical expressions for the nonlinear current-voltage chracteristics as well as the shot noise in the latter regime. Applying the mapping in the opposite direction, we elucidate the finding of super-Poissonian noise in the positive-U Anderson model at high temperatures, by relating the correlations between spin flips to pair-tunneling processes at negative U.
Cite
@article{arxiv.cond-mat/0610746,
title = {Nonequilibrium charge-Kondo transport through negative-U molecules},
author = {Jens Koch and Eran Sela and Yuval Oreg and Felix von Oppen},
journal= {arXiv preprint arXiv:cond-mat/0610746},
year = {2009}
}
Comments
11 pages, 5 figures