Thermopower of the molecular state in a double quantum dot

The thermopower of the molecular state in a double quantum dot is studied u sing a mixed model, which combines the classical capacitance model and a va lence-electron approach. Our calculations show that close to the triple poi nts where the resonances of the two dots intersect, there are additional st eplike structures in the thermopower that result from coupling of the "topm ost" electronic states. Far away from the triple points, we find that, with increasing detuning, the steplike structures shift toward the center of tw o neighboring Coulomb blockade oscillations, while very far away from the t riple points, the transport resembles that of a single dot of lower electro static energy. Our results are in qualitative agreement with experimental f indings on the conductance of Blick et al.