Kondo Correlations and the Fano Effect in Closed AB-Interferometers

Abstract

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 $\varphi$ and level position $\epsilon$. In the unitary limit, $G(\varphi )$ reaches its maximum $2e^2/h$ at $\varphi =\pi /2$. We find a Fano-suppressed Kondo plateau for $G(\epsilon )$ similar to recent experiments.

4 pages, 4 eps figures

References in corpus (1)

• Fano and Kondo resonance in electronic current through nanodevices

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