Temperature dependence of polaronic transport through single molecules and quantum dots

Details Temperature dependence of polaronic transport through single molecules and quantum dots Temperature dependence of polaronic transport through single molecules and quantum dots

2002-03-27

arxiv.org/abs/cond-mat/0203548v2

Phys. Rev. B 66, 75303 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.66.075303

Motivated by recent experiments on electric transport through single molecules and quantum dots, we investigate a model for transport that allows for significant coupling between the electrons and a boson mode isolated on the molecule or dot. We focus our attention on the temperature dependent properties of the transport. In the Holstein picture for polaronic transport in molecular crystals the temperature dependence of the conductivity exhibits a crossover from coherent (band) to incoherent (hopping) transport. Here, the temperature dependence of the differential conductance on resonance does not show such a crossover, but is mostly determined by the lifetime of the resonant level on the molecule or dot.

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