Singularity of the density of states in the two-dimensional Hubbard model from finite-size scaling of Yang-Lee zeros

Article

关键词: PARTITION-FUNCTION;    MEAN-FIELD;    SUPERCONDUCTIVITY;    MECHANISM;   

DOI  :  10.1103/PhysRevB.53.7704

来源: SCIE

【 摘 要 】

A finite-size scaling is applied to the Yang-Lee zeros of the grand canonical partition function for the two-dimensional Hubbard model in the complex chemical potential plane. The logarithmic scaling of the imaginary part of the zeros with the system size indicates a singular dependence of the carrier density on the chemical potential. Our analysis points to a second-order phase transition with critical exponent 1/delta(=)1/2+/-1/3 which leads to a divergence of the electronic susceptibility. We interpret these results as reflecting the singular behavior of the density of states in the quasiparticle spectrum.

【 授权许可】

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