Ingersent K, Ludwig AWW, Affleck I. Kondo screening in a magnetically frustrated nanostructure: exact results on a stable non-fermi-liquid phase.
PHYSICAL REVIEW LETTERS 2005;
95:257204. [PMID:
16384503 DOI:
10.1103/physrevlett.95.257204]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2005] [Indexed: 05/05/2023]
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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