From local to nonlocal correlations: The Dual Boson perspective

Article

关键词: MEAN-FIELD THEORY;    NARROW ENERGY-BANDS;    ELECTRON CORRELATIONS;    SPATIAL CORRELATIONS;    DIMENSIONS;    TRANSITION;   

DOI  :  10.1103/PhysRevB.94.205110

来源: SCIE

【 摘 要 】

Extended dynamical mean-field theory (EDMFT) is insufficient to describe nonlocal effects in strongly correlated systems, since corrections to the mean-field solution are generally large. We present an efficient scheme for the construction of diagrammatic extensions of EDMFT that avoids the usual double-counting problem by using an exact change of variables (the Dual Boson formalism) to distinguish the correlations included in the dynamical mean-field solution and those beyond. With a computational efficiency comparable to the EDMFT + GW approach, our scheme significantly improves on the charge order transition phase boundary in the extended Hubbard model.

【 授权许可】

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