Correlation functions for composite operators in the Hubbard model
强关联电子
2007-05-23 v1 超导电性
高能物理 - 理论
摘要
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.
引用
@article{arxiv.cond-mat/0107390,
title = {Correlation functions for composite operators in the Hubbard model},
author = {Tobias Baier and Eike Bick and Christof Wetterich},
journal= {arXiv preprint arXiv:cond-mat/0107390},
year = {2007}
}
备注
29 pages, 5 figures