Crossover Induced Electron Pairing and Superconductivity by Kinetic Renormalization in Correlated Electron Systems

Condensed Matter

Yamaji, Kunihiko¹  Miyazaki, Mitake²  Yanagisawa, Takashi³ 

[1] Author to whom correspondence should be addressed.;Hakodate Institute of Technology, 14-1 Tokura, Hakodate, Hokkaido 042-8501, Japan;National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

关键词: strongly correlated electron systems;    mechanism of superconductivity;    high-temperature superconductivity;    kinetic mechanism of superconductivity;    optimization variational Monte Carlo method;    Hubbard model;   

DOI  :  10.3390/condmat3030026

学科分类：凝聚态物理

来源: mdpi

【 摘 要 】

We investigate the ground state of strongly correlated electron systems based on an optimization variational Monte Carlo method to clarify the mechanism of high-temperature superconductivity. The wave function is optimized by introducing variational parameters in an exponential-type wave function beyond the Gutzwiller function. The many-body effect plays an important role as an origin of superconductivity in a correlated electron system. There is a crossover between weakly correlated region and strongly correlated region, where two regions are characterized by the strength of the on-site Coulomb interaction U. We insist that high-temperature superconductivity occurs in the strongly correlated region.

【 授权许可】

CC BY