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Kondo correlations and the Fano effect in closed Aharonov-Bohm interferometers

Kondo correlations and the Fano effect in closed Aharonov-Bohm interferometers

Physical Review Letters 87(15): 156803

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 the Keldysh formalism, the Friedel sum rule, and the numerical renormalization group, we calculate the exact zero-temperature linear conductance G as a function of the AB phase phi and level position epsilon. In the unitary limit, G(phi) reaches its maximum 2e(2)/h at phi = pi/2. We find a Fano-suppressed Kondo plateau for G(epsilon) similar to recent experiments.

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Accession: 046508941

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PMID: 11580718

DOI: 10.1103/PhysRevLett.87.156803

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