Filling dependence of correlation exponents and metal-Mott insulator transition in strongly correlated electron systems

• Published in: Chinese physics B Vol. 19; no. 12; pp. 484 - 488
• Main Author: 林明喜 祁胜文
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.12.2010
• Subjects: Hubbard模型; 填充因子; 强关联电子系统; 指数和; 气相色谱; 绝缘体
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/12/127401

Using a universal relation between electron filling factor and ground state energy, this paper studies the dependence of correlation exponents on the electron filling factor of one-dimensional extended Hubbard model in a strong coupling regime, and demonstrates that in contrast to the usual Hubbard model （gc = 1/2）, the dimensionless coupling strength parameter gc heavily depends on the electron filling, and it has a ＂particle-hole＂ symmetry about electron quarter filling point. As increasing the nearest neighbouring repulsive interaction, the single particle spectral weight is transferred from low energy to high energy regimes. Moreover, at electron quarter filling, there is a metal-Mott insulator transition at the strong coupling point gc = 1/4, and this transition is a continuous phase transition.