title: Zero-field kondo splitting and quantum-critical transition in double quantum dots.
abstract: Double quantum dots offer unique possibilities for the study of many-body correlations. A system containing one Kondo dot and one effectively noninteracting dot maps onto a single-impurity Anderson model with a structured (nonconstant) density of states. Numerical renormalization-group calculations show that, while band filtering through the resonant dot splits the Kondo resonance, the singlet ground state is robust. The system can also be continuously tuned to create a pseudogapped density of states and access a quantum-critical point separating Kondo and non-Kondo phases.
authors.affiliation: Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA.
authors.forename: Luis G G V
authors.initials: LG
authors.lastname: Dias da Silva
authors.forename: Nancy P
authors.initials: NP
authors.lastname: Sandler
authors.forename: Kevin
authors.initials: K
authors.lastname: Ingersent
authors.forename: Sergio E
authors.initials: SE
authors.lastname: Ulloa