Kondo screening in a magnetically frustrated nanostructure: exact results on a stable non-fermi-liquid phase.
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.
Ingersent
Kevin
K
Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
Ludwig
Andreas W W
AW
Affleck
Ian
I