Finite‐Frequency Transport Through A Quantum Dot In The Kondo Regime Available to Purchase

We study the ac conductance and equilibrium current fluctuations of a Coulomb blockaded quantum dot in the Kondo regime. To this end we have developed an extension of the numerical renormalization group suitable for the nonperturbative calculation of finite‐frequency transport properties. We demonstrate that ac transport gives access to the many‐body resonance in the equilibrium spectral density. It provides a new route to measuring this key signature of Kondo physics, which so far has defied direct experimental observation.