Systematic mapping of the Hubbard model to the generalized t-J model

Article

关键词: FLOW-EQUATIONS;    RENORMALIZATION-GROUP;    INFINITE DIMENSIONS;    HAMILTONIANS;    SUPERCONDUCTORS;    TEMPERATURE;    EXPANSION;    INSULATOR;    FERMIONS;    ABSENCE;   

DOI  :  10.1103/PhysRevB.70.245124

来源: SCIE

【 摘 要 】

The generalized t-J model conserving the number of double occupancies is constructed from the Hubbard model at and in the vicinity of half-filling at strong coupling. The construction is realized by a self-similar continuous unitary transformation. The flow equation is closed by a truncation scheme based on the spatial range of processes. We analyze the conditions under which the t-J model can be set up and we find that it can only be defined for sufficiently large interaction. There, the parameters of the effective model are determined.

【 授权许可】

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