Nonequilibrium charge-Kondo transport through negative- U molecules

Jens Koch, Eran Sela, Yuval Oreg, Felix Von Oppen

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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 transport in the spin-Kondo and charge-Kondo regimes, and derive analytical expressions for the nonlinear current-voltage characteristics 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.

Original languageEnglish
Article number195402
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
StatePublished - 2 May 2007
Externally publishedYes


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