Lattice theoretical approach in strongly correlated electron systems

• Main Authors: Mu-Kun Lee, Chyh-Hong Chern
• Format: Article
• Language: English
• Published: Elsevier 2019-06-01
• Series: Results in Physics
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211379718321375

The effective lattice models in strongly correlated electron systems are derived in particular for the cuprate superconductors, that incorporate the quantum fluctuations of the spin Berry’s phase and the antiferromagnetic fluctuation. Consistent with the field-theoretical approach, the density modulation, the weak ferromagnetism, and the superconductivity are reproduced. We discussed the pros and cons of the effective-model approach and demonstrate that both positive and negative Hubbard model are the effective models subject to the occurrence of the quantum fluctuations of the correlation degrees of freedom.