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We investigate the Fano-Kondo interplay in an Aharonov-Bohm ring with anembedded non-interacting quantum dot and a Coulomb interacting quantum dot.Using a slave-boson mean-field approximation we diagonalize the Hamiltonian viascattering matrix theory, and derive the conductance in the form of a Fanoexpression, which depends on the mean field parameters. We predict that in theKondo regime the magnetic field leads to a gapped energy level spectrum due tohybridisation of the non-interacting QD state and the Kondo state, and canquantum-mechanically alter the electron's path preference. We demonstrate thatan abrupt symmetry change in the Fano resonance, as seen experimentally, couldbe a consequence of an underlying Kondo channel.

Magnetic flux tuning of Fano-Kondo interplay in a parallel double quantum dot system