Two Channel Multi impurity Kondo model

2025/02/11 by A. M. Tsvelik, Tsvelik, A. M., Gabriel Kotliar +1
Engineering · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Thermodynamic and Structural Properties of Metals and Alloys

paper · pdf · doi:10.48550/arxiv.2502.07506

openalex publication_date 2025/02/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

We show that the Ruderman-Kittel-Kasua-Yoisida interaction between overscreened spins in two channel Kondo impurity systems is a relevant perturbation when the number of impurities N is greater than 3 driving the system to a new quantum critical point with anomalous dimensions (1)/( (N+1)) for the spin operator and the Sommerfeld coefficient of the specific heat scales as γ∼ T^{- (3)/(N+1)}. The critical point universal properties are relevant to many strong correlation problems, such as impurity placed in a Majorana metal and the multichannel Kondo lattice model of heavy fermion materials. We discuss relevance of our results for cluster DMFT studies of quantum criticality.

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