ZhenHua Li, NingHua Tong, JianHua Wei, Xiao Zheng, Jie Hu, YiJing Yan
A hierarchical equations of motion based numerical approach is developed for accurate and efficient evaluation of dynamical observables of strongly correlated quantum impurity systems. This approach is capable of describing quantitatively Kondo resonance and Fermi liquid characteristics, achieving the accuracy of latest high-level numerical renormalization group approach, as demonstrated on single-impurity Anderson model systems. Its application to a two-impurity model reproduces the experimentally observed crossover behavior, which affirms the continuous transition from the Kondo singlet state of individual impurity to the singlet spin-state formed between two impurities.
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http://arxiv.org/abs/1207.6359
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