Two-Dimensional Hubbard Model at Low Electron Density
Two-Dimensional Hubbard Model at Low Electron Density
复制标题
低电子密度下的二维哈伯德模型
DOI:
10.1143/jpsj.60.2013
复制
发表时间:
1991
影响因子:
1.7
通讯作者:
O. Narikiyo
中科院分区:
文献类型:
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作者:
H. Fukuyama;Y. Hasegawa;O. Narikiyo
The two dimensional Hubbard model with repulsive interaction is studied in the t -matrix approximation, which is the valid approximation in low electron density. The particle-particle correlation function and the t -matrix are obtained analytically. By use of these analytical results it is shown that the t -matrix and hence the self-energy have no singularities in the upper half plane of the complex energy variable. The phase angle δ(2 k F + q , ω), with k F being the Fermi wave vector, in the limit of q =0 and ω=0 is found to depend strongly on the ratio ω/ q and is not always zero. The case of the attractive interaction is also briefly studied.
DOI:
10.1007/bf01303701
发表时间:
1986-01-01
期刊:
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子:
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作者:
BEDNORZ, JG;MULLER, KA
通讯作者:
MULLER, KA
DOI:
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发表时间:
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期刊:
影响因子:
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作者:
通讯作者:
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