Deformation of Fermi Surface Due to Antiferromagnetic Correlation

Details Deformation of Fermi Surface Due to Antiferromagnetic Correlation Deformation of Fermi Surface Due to Antiferromagnetic Correlation

1999-12-16

arxiv.org/abs/cond-mat/9912292v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages

Scientific paper

10.1016/S0921-4526(99)00913-8

It is investigated, on the basis of the fluctuation exchange approximation, how the shape of the Fermi surface is modified in two-dimensional $t-t'-U$ Hubbard model at half filling as strength of the onsite Coulomb interaction $U$ is increased. The antiferromagnetic (AF) correlation length is shown to be enhanced as the Coulomb interaction get closer to the critical value $U_{\rm c}$ for the onset AF order. At the same time, the shape of the renormalized Fermi surface is deformed showing the tendency of nesting near $U_{\rm c}$.

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