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Correlation effects on the Fermi surface of the two-dimensional Hubbard model
Otsuka, Y.
Morita, Y.
初貝, 安弘
ハツガイ, ヤスヒロ
HATSUGAI, Yasuhiro
Effects of electron correlation on the Fermi surface (FS) is investigated for the two-dimensional Hubbard model by the quantum Monte Carlo method. At first, an infinitesimal doping from the half-filling is focused on and the momentum-dependent charge susceptibility κ(k)=dn(k)/dμ is calculated at a finite temperature. At the temperature Tnot, vert, similart2/U, it shows peak structure at (±π/2,±π/2) on the FS (line). It is consistent with the mean-field prediction of the d-wave pairing state or the staggered flux state. This momentum-dependent structure disappears at the high temperature T≈U. After summarizing the results of the half-filling case, we also discuss the effects of the doping on the momentum-dependent charge susceptibility. The anisotropic structure at half-filling fades out with sufficient doping.
other
Elsevier
2002
application/pdf
The journal of physics and chemistry of solids
6-8
63
1389
1391
0022-3697
AA00704949
https://tsukuba.repo.nii.ac.jp/record/16930/files/JPCS_63-6-8.pdf
eng
https://doi.org/10.1016/S0022-3697(02)00057-4
© 2002 Published by Elsevier Science Ltd.
open access