Cumulant approach to the low-temperature thermodynamics of many-body systems

Details Cumulant approach to the low-temperature thermodynamics of many-body systems Cumulant approach to the low-temperature thermodynamics of many-body systems

1997-06-24

arxiv.org/abs/cond-mat/9706243v1

Phys. Rev. B 56, 6603 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 3 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.56.6603

Current methods to describe the thermodynamic behavior of many-particle systems are often based on perturbation theory with an unperturbed system consisting of free particles. Therefore, only a few methods are able to describe both strongly and weakly correlated systems along the same lines. In this article we propose a cumulant approach which allows for the evaluation of excitation energies and is especially appropriate to account for the thermodynamics at low temperatures. The method is an extension of a cumulant formalism which was recently proposed to study statical and dynamical properties of many-body systems at zero temperature. The present approach merges into the former one for vanishing temperature. As an application we investigate the thermodynamics of the hole-doped antiferromagnetic phase in high-temperature superconductors in the framework of the anisotropic t-J model.

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