Superconductivity in the Half-Filled Hubbard-Holstein Model in the Antiadiabatic Region
Superconductivity in the Half-Filled Hubbard-Holstein Model in the Antiadiabatic Region
复制标题
抗绝热区半填充哈伯德-荷尔斯泰因模型中的超导性
DOI：
10.1143/jpsj.65.1544
复制
发表时间：
1996
影响因子：
1.7
通讯作者：
Y. Takada
中科院分区：
文献类型：
--
作者：
Y. Takada
我们研究了一个电子-声子模型与现场库仑斥力U e e在半填充精确对角化结合平均场近似，给出了准确的结果在窄带宽的情况下。超导电性与离位配对被发现存在逆同位素效应，当且仅当声子介导的吸引力几乎被抵消的U e e。
We study an electron-phonon model with on-site Coulomb repulsions U e e at half filling by exact diagonalization combined with a mean-field approximation which gives accurate results in the narrow-bandwidth case. Superconductivity with off-site pairing is found to exist with an inverse isotope effect if and only if the phonon-mediated attraction is almost offset by U e e .