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Deformation of Fermi Surface Due to Antiferromagnetic Correlation

K. Morita·K. Miyake
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Abstract

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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K. Morita, K. Miyake. 1999-12-16. Deformation of Fermi Surface Due to Antiferromagnetic Correlation. https://doi.org/10.1016/s0921-4526(99)00913-8

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