Perturbation Expansion of the Partition Sum for any Temperature

Details Perturbation Expansion of the Partition Sum for any Temperature Perturbation Expansion of the Partition Sum for any Temperature

1998-02-04

arxiv.org/abs/cond-mat/9802051v2

Physics

Condensed Matter

Strongly Correlated Electrons

22 pages, latex, needs PSTricks-macro from Princeton University, new version with some minor corrections of mistyped formulas

Scientific paper

Based on the special properties of Liouville eigenoperators a perturbation theory for the partition sum is given. It is applicable for any temperature and includes the case of degenerate Hamiltonians. To demonstrate the reliability of the method, the second order correction to the atomic limit grand canonical potential of the Hubbard model is calculated and compared to results known from the literature.

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