title: Kondo screening in a magnetically frustrated nanostructure: exact results on a stable non-fermi-liquid phase.
abstract: Triangular symmetry stabilizes a novel non-Fermi-liquid phase in the three-impurity Kondo model with frustrating antiferromagnetic interactions between half-integer impurity spins. The phase arises without fine-tuning of couplings, and is stable against magnetic fields and particle-hole symmetry breaking. We find a conformal field theory describing this phase, verify it using the numerical renormalization group, and extract various exact, universal low-energy properties. Signatures predicted in electrical transport may be testable in scanning tunneling microscopy or quantum-dot experiments.
authors.affiliation: Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Ingersent
authors.forename: Andreas W W
authors.initials: AW
authors.lastname: Ludwig
authors.forename: Ian
authors.initials: I
authors.lastname: Affleck