Nonlinear transport through a finite Hubbard chain connected to the electrodes
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0411414,
title = {Nonlinear transport through a finite Hubbard chain connected to the electrodes},
author = {Kamil Walczak},
journal= {arXiv preprint arXiv:cond-mat/0411414},
year = {2009}
}
Comments
9 pages, 5 figures