Kondo screening in a magnetically frustrated nanostructure: Exact results on a stable, non-Fermi-liquid phase
arXiv:cond-mat/0505303 · doi:10.1103/PhysRevLett.95.257204
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.
4 pages, published version (shortened, minor corrections)