title: Frequency-dependent transport through a quantum dot in the Kondo regime.
abstract: 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 for measuring this key signature of Kondo physics, which so far has defied direct experimental observation.
authors.affiliation: Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Sindel
authors.forename: W
authors.initials: W
authors.lastname: Hofstetter
authors.forename: J
authors.initials: J
authors.lastname: von Delft
authors.forename: M
authors.initials: M
authors.lastname: Kindermann