Nonlinear transport through a finite Hubbard chain connected to the electrodes

Details Nonlinear transport through a finite Hubbard chain connected to the electrodes Nonlinear transport through a finite Hubbard chain connected to the electrodes

2004-11-16

arxiv.org/abs/cond-mat/0411414v1

Physica B 365, pp. 193-200 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

10.1016/j.physb.2005.05.014

Coherent electronic transport through a molecular device is studied using non-equilibrium Green's function (NEGF) formalism. Such device is made of a short linear wire which is connected to para- and ferromagnetic electrodes. Molecule itself is described with the help of Huckel (tight-binding) model with the electron interactions treated within Hubbard approach, while the coupling to the electrodes is modeled through the use of a broad-band theory. Coulomb interactions within molecular wire are treated by means of the Hartree-Fock (HF) approximation. For the case of asymmetric coupling to paramagnetic electrodes, charging-induced rectification effect in biased molecular devices is discussed as a consequence of Coulomb repulsion. For the system with ferromagnetic electrodes, a significant magnetoresistance (MR) is predicted and its oscillations generated by Coulomb interactions are considered.

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