Transport through a T-shaped double quantum dot with Fano–Kondo interaction

We present transport properties of a strongly correlated quantum dot attached to two leads with a side coupled non-interacting quantum dot. Transport properties are analyzed using the slave boson mean field theory which is reliable in the zero temperature and low bias regime. It is found that the transport properties are determined by the interplay of two fundamental physical phenomena, i.e. the Kondo effects where the conductance can reach the unitary limit and the Fano interference which leads to an asymmetric shape of the conductance as function of the gate voltage. It is found that the Kondo effects will be suppressed by the Fano interference. The linear conductance will depart from the unitary limit and the zero bias anomaly will be suppressed in the presence of interdot coupling. If the spin degeneracy of the side coupled dot is lifted, for example, by external magnetic field, the linear conductance of electrons with different spin displays dips at different position. This result might be useful for the design of spin filters.