Mott transition and superconductivity in the two-band Hubbard model in infinite dimensions
Mott transition and superconductivity in the two-band Hubbard model in infinite dimensions
复制标题
无限维双能带哈伯德模型中的莫特跃迁和超导性
DOI：
10.1016/s0022-3697(00)00147-5
复制
发表时间：
2001
影响因子：
4
通讯作者：
K. Sano
中科院分区：
文献类型：
--
作者：
Y. Ono;K. Sano
采用精确对角化方法研究了无限维双能哈伯德模型中的电子态。在半填充的情况下，分隔金属和绝缘区域的边界被计算为现场排斥相互作用 U 和电荷转移能量 Δ 的函数。当 U<Δ 时，获得 Mott-Hubbard 型金属-绝缘体转变，而当 U>Δ 时，获得电荷转移型金属-绝缘体转变。在掺杂情况下，现场配对磁化率是在有限温度下计算的。超导的临界温度存在于电荷转移型中，但没有存在于莫特-哈伯德型中。
Electronic states in the two-band Hubbard model with infinite dimensions are investigated by using the exact diagonalization method. In the half-filled case, the boundary separating the metallic and the insulating regimes is calculated as the function of the on-site repulsive interaction U and the charge-transfer energy Δ. The metal–insulator transition of Mott–Hubbard type is obtained for U<Δ while that of charge-transfer type is obtained for U>Δ. In the doped case, on-site paring susceptibility is calculated at finite temperature. The critical temperature of the superconductivity is found in a charge-transfer type but not in a Mott–Hubbard type.