  Electrical conduction through a two-terminal molecular device is studied
using non-equilibrium Green's functions (NEGF) formalism. Such junction is made
of a short linear wire which is connected to the metallic electrodes. Molecule
itself is described with the help of Huckel (tight-binding) model with the
electron interactions treated within extended Hubbard model (EHM), while the
coupling to the electrodes is described with the help of a broad-band theory.
Coulomb interactions within molecular wire are treated by means of the
restricted Hartree-Fock (RHF) approximation. In particular, the influence of
short-range and long-range Coulomb interactions on electrical transport
characteristics is discussed in detail.
