  A first-principles approach based on Density Functional Theory and
Non-Equilibrium Green's functions is used to study the molecular transport
system consisting of benzenedithiolate connected with monoatomic gold and
platinum electrodes. Using symmetry arguments we explain why the conductance
mechanism is different for gold and platinum electrodes. We present the charge
stability diagram for the benzenedithiolate connected with monoatomic platinum
electrodes including many-body effects in terms of an extended Hubbard
Hamiltonian and discuss how the electrodes and the many-body effects influence
the transport properties of the system.
