Charging effects in biased molecular devices

Details Charging effects in biased molecular devices Charging effects in biased molecular devices

2004-05-14

arxiv.org/abs/physics/0405067v2

Physica E 25 (No.4), pp. 530-534 (2004)

Physics

Chemical Physics

5 pages, 3 figures; accepted in Physica E

Scientific paper

10.1016/j.physe.2004.08.102

The influence of the charging effects on the transport characteristics of a molecular wire bridging two metallic electrodes in the limit of weak contacts is studied by generalized Breit-Wigner formula. Molecule is modeled as a quantum dot with discrete energy levels, while the coupling to the electrodes is treated within a broad band theory. Owing to this model we find self-consistent occupation of particular energy levels and orbital energies of the wire in the presence of transport. The nonlinear conductance and current-voltage characteristics are investigated as a function of bias voltage in the case of symmetric and asymmetric coupling to the electrodes. It is shown that the shape of that curves are determined by the combined effect of the electronic structure of the molecule and by electron-electron repulsion.

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