title: Two-channel Kondo physics in two-impurity Kondo models.
abstract: We consider the non-Fermi-liquid quantum critical state of the spin-S two-impurity Kondo model and its potential realization in a quantum dot device. Using conformal field theory and the numerical renormalization group, we show the critical point to be identical to that of the two-channel Kondo model with additional potential scattering, for any spin S. Distinct conductance signatures are shown to arise as a function of device asymmetry, with the square-root behavior commonly believed to arise at low-energies dominant only in certain regimes.
authors.affiliation: Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany.
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Mitchell
authors.forename: Eran
authors.initials: E
authors.lastname: Sela
authors.forename: David E
authors.initials: DE
authors.lastname: Logan