Two-Dimensional Hubbard Model at Low Electron Density

Two-Dimensional Hubbard Model at Low Electron Density
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低电子密度下的二维哈伯德模型

DOI:
10.1143/jpsj.60.2013
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发表时间:
1991
影响因子:
1.7
通讯作者:
O. Narikiyo
O. Narikiyo
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
H. Fukuyama;Y. Hasegawa;O. Narikiyo

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在t矩阵近似下研究了具有排斥相互作用的二维Hubbard模型,t矩阵近似是低电子密度下的有效近似。解析地得到了粒子-粒子关联函数和t矩阵。通过使用这些分析结果,它表明,t矩阵,从而自能没有奇异性的上半平面的复杂的能量变量。发现在q =0和ω=0的极限下,相角δ(2kF + q,ω)(其中kF为费米波矢)强烈地依赖于比值ω/ q,并且不总是为零。吸引相互作用的情况下也进行了简要的研究。
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: --
作者:
BEDNORZ, JG;MULLER, KA
通讯作者: MULLER, KA
A.Tokumitsu,K.Miyake,K.Yamada:“费米子对之间的排斥效应对库珀对和玻色-爱因斯坦凝聚之间的交叉问题的影响”Physica B.
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