Strongly correlated superconductivity
Strongly correlated superconductivity
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强相关超导性
DOI：
10.1142/s0217979218400234
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发表时间：
2018
影响因子：
1.7
通讯作者：
Takashi Yanagisawa
中科院分区：
文献类型：
--
作者：
K. Nishimura;M. Kakihana;F. Suzuki;T. Yara;M. Hedo;T. Nakama;Y. Onuki;H. Harima;Takashi Yanagisawa
研究了强关联电子系统基态的电子性质。我们用最优化变分蒙特卡罗方法对二维Hubbard模型和三带d-p模型进行了计算。通过引入控制电子间关联的变分参数，对多体波函数进行了改进和优化。原位排斥库仑相互作用诱导了强的反铁磁关联。随着U的增加，存在从弱相关区域到强相关区域的交叉。我们提出了一个想法，即高温超导性发生作为这种交叉的结果，在强相关区域，其中U大于带宽。
We investigate the electronic properties of the ground state of strongly correlated electron systems. We use an optimization variational Monte Carlo method for the two-dimensional Hubbard model and the three-band d-p model. The many-body wavefunction is improved and optimized by introducing variational parameters that control the correlation between electrons. The on-site repulsive Coulomb interactionUinduces strong antiferromagnetic (AF) correlation. There is a crossover from weakly to strongly correlated regions asUincreases. We show an idea that high-temperature superconductivity occurs as a result of this crossover in the strongly correlated region whereUis greater than the bandwidth.