Abstract
Electron transport through a double quantum dot system is studied with the use of theGreen function formalism based on the equation of motion method, and an interplaybetween interference and Coulomb blockade effects due to inter-dot correlations isdiscussed. A double structure with two Fano resonances (or antiresonances) isfound in the conductance spectrum. Fano features are weakly influenced by thepresence of Coulomb interaction but the conductance is strongly suppressed in theenergy region with the Fermi level in the leads close to the aligned levels of bothdots. This Coulomb blockade effect takes place when the coupling between thedots is of repulsive character. On the other hand, the conductance of an artificialmolecule with attractive inter-dot coupling is only slightly modified in this energyregion. As a sign of the coupling can be easily changed in a presence of an externalmagnetic field by changes of the magnetic flux there is the possibility to controlvariations of the conductance, which may be important from the application point ofview.
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