Mutual information, quantum phase transition, and phase coherence in Kondo systems

@article{Dong2021MutualIQ,
  title={Mutual information, quantum phase transition, and phase coherence in Kondo systems},
  author={Jian-Jun Dong and Dongchen Huang and Yi-feng Yang},
  journal={Physical Review B},
  year={2021}
}
We propose a static auxiliary field approximation to study the hybridization physics of Kondo systems without the sign problem and use the mutual information to measure the intersite hybridization correlations. Our method takes full account of the spatial fluctuations of the hybridization fields at all orders and overcomes the artificial (first-order) phase transition predicted in the mean-field approximation. When applied to the two-impurity Kondo model, it reveals a logarithmically divergent… 
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