Conductance of a double quantum dot with correlation–induced wave function renormalization

The zero–temperature conductance of diatomic molecule, modelled as a correlated double quantum dot attached to noninteracting leads is investigated. We utilize the Rejec–Ramšak formulas, relating the linear–response conductance to the ground–state energy dependence on magnetic flux within the framework of EDABI method, which combines exact diagonalization with ab initio calculations. The single–particle basis renormalization leads to a strong particle–hole asymmetry, of the conductance spectrum, absent in a standard parametrized model study. We also show, that the coupling to leads V ≈ 0.5t (t is the hopping integral) may provide the possibility for interatomic distance manipulation due to the molecule instability.