Finite-temperature Gutzwiller projection for strongly correlated electron systems

Article

关键词: T-J MODEL;    MOTT INSULATOR;    MONTE-CARLO;    SUPERCONDUCTIVITY;    FIELD;    APPROXIMATION;    PHYSICS;   

DOI  :  10.1103/PhysRevB.82.125105

来源: SCIE

【 摘 要 】

We generalized the Gutzwiller projectional variational method for the ground state of strongly correlated electron systems to the case of finite temperature. Under the Gutzwiller approximation, we show that this maps to a finite temperature renormalized mean-field theory. As one of the key ingredients in the theory, we obtained an explicit expression of the projection entropy or the entropy change due to the projection. We illustrate the application of the theory to the Anderson impurity problem and the half-filled Hubbard model and compare the theory to more elaborate techniques. We find qualitative agreement. The theory can be applied to a wide variety of Hubbard, t-J, and Anderson impurity models.

【 授权许可】

Free