Anisotropy on the Fermi surface of the two-dimensional Hubbard model

Article

关键词: QUASI-PARTICLE DISPERSION;    T-J MODEL;    INSULATOR;    METAL;    SUPERCONDUCTORS;   

DOI  :  10.1103/PhysRevB.66.073109

来源: SCIE

【 摘 要 】

We investigate anisotropic charge fluctuations in the two-dimensional Hubbard model at half-filling. By the quantum Monte Carlo method, we calculate a momentum-resolved charge compressibility kappa(k)=d/dmu, which shows the effects of an infinitesimal doping. At the temperature Tsimilar tot(2)/U, kappa(k) shows a peak structure at the (+/-pi/2,+/-pi/2) points along the \k(x)\+\k(y)\=pi line. A similar peak structure is reproduced in the mean-field calculation for the d-wave pairing state or the staggered flux state.

【 授权许可】

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