Correlation functions for composite operators in the Hubbard model

Details Correlation functions for composite operators in the Hubbard model Correlation functions for composite operators in the Hubbard model

2001-07-18

arxiv.org/abs/cond-mat/0107390v1

Physics

Condensed Matter

Strongly Correlated Electrons

29 pages, 5 figures

Scientific paper

We compute the correlation functions for antiferromagnetic and d-wave superconducting fermion bilinears in a generalized mean field type approximation for the Hubbard model. For high temperature our explicit expressions show that homogeneous field configurations are preferred for these composite bosons. Below a critical temperature we find spontaneous symmetry breaking with homogeneous expectation values of the composite fields. Our results can be used to device a nonperturbative flow equation for the exploration of the low temperature regime.

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