title: Quantum criticality in a double-quantum-dot system.
abstract: We discuss the realization of the quantum-critical non-Fermi-liquid state, originally discovered within the two-impurity Kondo model, in double-quantum-dot systems. Contrary to common belief, the corresponding fixed point is robust against particle-hole and various other asymmetries and is unstable only to charge transfer between the two dots. We propose an experimental setup where such charge transfer processes are suppressed, allowing a controlled approach to the quantum-critical state. We also discuss transport and scaling properties in the vicinity of the critical point.
authors.affiliation: Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany.
authors.forename: Gergely
authors.initials: G
authors.lastname: Zaránd
authors.forename: Chung-Hou
authors.initials: CH
authors.lastname: Chung
authors.forename: Pascal
authors.initials: P
authors.lastname: Simon
authors.forename: Matthias
authors.initials: M
authors.lastname: Vojta