Anisotropy on the Fermi Surface of the Two-Dimensional Hubbard Model

Details Anisotropy on the Fermi Surface of the Two-Dimensional Hubbard Model Anisotropy on the Fermi Surface of the Two-Dimensional Hubbard Model

2001-06-21

arxiv.org/abs/cond-mat/0106420v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, figures and presentation are modified

Scientific paper

10.1103/PhysRevB.66.073109

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 $\kappa (\bm{k}) = {d < n(\bm{k}) >}/{d \mu}$, which shows effects of an infinitesimal doping. At the temperature $T \sim {t^2}/{U}$, $\kappa (\bm{k})$ shows peak structure at the $(\pm \pi/2,\pm \pi/2)$ points along the $|k_x| + |k_y| = \pi$ line. A similar peak structure is reproduced in the mean-filed calculation for the d-wave pairing state or the staggered flux state.

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