Kondo Correlations and the Fano Effect in Closed AB-Interferometers

Details Kondo Correlations and the Fano Effect in Closed AB-Interferometers Kondo Correlations and the Fano Effect in Closed AB-Interferometers

2001-04-25

arxiv.org/abs/cond-mat/0104497v2

Phys. Rev. Lett. 87, 156803 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.87.156803

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 Keldysh formalism, Friedel sum rule and Numerical Renormalization Group, we calculate the exact zero-temperature linear conductance $G$ as a function of 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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