Abstract
By means of the nonequilibrium Green function and equation of motion method,the electronic transport is theoretically studied through a parallel-coupleddouble quantum dot (DQD) in the presence of on-dot Coulomb interactionU. With focus on the quantum interference in theU-dominant parallel-coupled DQD, we find two types of Fano interferences in theconductance spectra. If the one-particle DQD bonding and antibonding bandsare well separated from their Coulomb blockade counterparts, the main featuresof Fano interference in usual DQD systems are recovered with minor revisions.The most interesting is the hybridization between the antibonding state and theCoulomb counterpart of the bonding state, which gives rises to two new channels forFano resonance. The Fano interference in the Coulomb hybridized systems can becontrolled by the electrostatic and magnetic approaches, and exhibits properties quitedifferent from what are reported in the noninteracting Fano–Anderson model.
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