  Theoretical and experimental values to date for the resistances of single
molecules commonly disagree by orders of magnitude. By reformulating the
transport problem using boundary conditions suitable for correlated
many-electron systems, we approach electron transport across molecules from a
new standpoint. Application of our correlated formalism to benzene-dithiol
gives current-voltage characteristics close to experimental observations. The
method can solve the open system quantum many-body problem accurately, treats
spin exactly and is valid beyond the linear response regime.
