Fermi Surface of the 2D Hubbard Model at Weak Coupling
arXiv:cond-mat/9610216 · doi:10.1007/s002570050318
Abstract
We calculate the interaction-induced deformation of the Fermi surface in the two-dimensional Hubbard model within second order perturbation theory. Close to half-filling, interactions enhance anisotropies of the Fermi surface, but they never modify the topology of the Fermi surface in the weak coupling regime.
4 pages, LaTeX2e, 5 embedded EPS figures, accepted to be published in Z. Phys. B