Spectral function of the two-dimensional Hubbard model: A density matrix renormalization group plus cluster perturbation theory study

Article

关键词: QUASI-PARTICLE DISPERSION;    MEAN-FIELD THEORY;    SELF-ENERGY;    T-J;    CORRELATED SYSTEMS;    ELECTRON-SYSTEMS;    CHARGE MODES;    WEIGHT;    PHASE;    WEAK;   

DOI  :  10.1103/PhysRevB.93.081107

来源: SCIE

【 摘 要 】

We study the spectral function of the two-dimensional Hubbard model using cluster perturbation theory, and a density matrix renormalization group as a cluster solver. We reconstruct the two-dimensional dispersion at and away from half-filling using 2 x L ladders, with L up to 80 sites, yielding results with unprecedented resolution in excellent agreement with quantum Monte Carlo. The main features of the spectrum can be described with a mean-field dispersion, with kinks and pseudogap traced back to scattering between spin and charge degrees of freedom.

【 授权许可】

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