Thermal evolution of the single-particle spectral function in the half-filled Hubbard model and pseudogap

Article

关键词: ELECTRONIC-STRUCTURE;    NORMAL-STATE;    INSULATOR;    APPROXIMATION;    TRANSITION;    SYSTEMS;    ABSENCE;    GAP;   

DOI  :  10.1103/PhysRevB.107.125139

来源: SCIE

【 摘 要 】

In the half-filled one-orbital Hubbard model on a square lattice, we find pseudogap-like features in the form of two-peak structures associated with the momentum-resolved spectral function. These features exist within the temperature window TN <= T <= T*, where TN is the Neel temperature and T* is the temperature below which there exists a well-formed dip in the density of state. Inside the window TN <= T <= T*, the peak-to-peak separation in the two-peak structure of the momentum-resolved spectral function grows on moving away from the point (pi /2, pi /2) along the normal state Fermi surface toward (pi, 0), a behavior with remarkable similarities to what is observed in the d-wave state and pseudogap phase of high-Tc cuprates. We unveil these features by using a parallelized cluster-based Monte Carlo method for simulating the magnetic order parameter fields on a superlattice. The method enables us to access the momentum-resolved single-particle spectral function corresponding to a lattice size of eta 240 x 240 with an almost negligible finite-size effect.

【 授权许可】

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