Fano Interference versus Kondo Effect in Strongly Correlated T-Shaped Quantum Dots Embedded in an Aharonov--Bohm Ring

We theoretically investigate the properties of the ground state of the
strongly correlated T-shaped double quantum dots embedded in an
Aharonov--Bohm ring in the Kondo regime by means of the one-impurity
Anderson Hamiltonian. It is found that in this system, the persistent
current depends sensitively on the parity and size of the ring. With the
increase of interdot coupling, the persistent current is suppressed due
to the enhancing Fano interference weakening the Kondo effect. Moreover,
when the spin of quantum dot embedded in the Aharonov--Bohm ring is
screened, the persistent current peak is not affected by interdot
coupling. Thus this model may be a new candidate for detecting Kondo
screening cloud.