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