Kondo Correlations and the Fano Effect in Closed AB-Interferometers

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We study the Fano-Kondo effect in a closed Aharonov-Bohm (AB) interferometer which contains a single-level quantum dot and predict a frequency doubling of the AB oscillations as a signature of Kondo-correlated states. Using Keldysh formalism, Friedel sum rule and Numerical Renormalization Group, we calculate the exact zero-temperature linear conductance G as a function of AB phase ϕ and level position ε. In the unitary limit, G(ϕ) reaches its maximum 2e²/h at ϕ=π/2. We find a Fano-suppressed Kondo plateau for G(ε) similar to recent experiments.