期刊
PHYSICA B-CONDENSED MATTER
卷 312, 期 -, 页码 525-526出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0921-4526(01)01332-1
关键词
t-t ' Hubbard model; nesting; perturbational renormalization group
Perturbational renormalization group (RG) is used to study the renormalization of the Fermi surface (FS) of the t-t' Hubbard model. We construct and solve numerically the RG equations for t, t' and U, and found that FS is deformed towards nesting at half-filling. Phase boundary of the antiferromagnetic state and the paramagnetic state in U/t-t'/t plane is determined exactly in the weak coupling region. (C) 2002 Elsevier Science B.V. All rights reserved.
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