SU(4) Kondo Effect in a Mesoscopic Interferometer.

We investigate theoretically the transport properties of a closed Aharonov—Bohm interferometer containing two quantum dots in the Kondo limit. We find two distinct physical scenarios depending on the strength of the interdot Coulomb interaction. For negligible interdot interaction, transport is governed by the interference of two Kondo resonances, whereas for strong interdot interaction transport takes place via simultaneous correlations in both spin and orbital sectors. [ABSTRACT FROM AUTHOR]