Strong-coupling theory for the Hubbard model

Article

关键词: T-J MODEL;    WAVE-FUNCTION;    SUPERCONDUCTIVITY;    HOLE;    ANTIFERROMAGNET;    APPROXIMATION;   

DOI  :  10.1103/PhysRevB.61.12816

来源: SCIE

【 摘 要 】

We reanalyze the Hubbard-I approximation by showing that it is equivalent to an effective Hamiltonian describing Fermionic charge fluctuations, which can be solved by Bogoliubov transformation. As the most important correction in the limit of large U and weak spin correlations we augment this Hamiltonian by further effective particles, which describe composite objects of a Fermionic charge fluctuation and a spin-, density-, or eta excitation. The scheme is valid for positive and negative U. We present results for the single particle Green's function for the two-dimensional Hubbard model with and without t' and tterms, and compare to quantum Monte-Carlo results for the paramagnetic phase. The overall agreement is significantly improved over the conventional Hubbard-I or two-pole approximation.

【 授权许可】

Free