Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-04-22
J. Phys. Soc. Jpn. 77 (2008) 114708
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages, 7 figures, title changed, added an appendix and figures
Scientific paper
10.1143/JPSJ.77.114708
The effect of fluctuations about the pi-flux mean field state for the undoped high-temperature superconductors is investigated. It is shown that fluctuations of the mean fields lead to a self-energy correction that doubles the band width of the fermion dispersion in the lowest order. The dynamical mass generation is associated with the self-energy effect due to the interaction mediated by the Lagrange multiplier field, which is introduced to impose the constraint on the fermions. A self-consistent picture about the mass generation and the prop- agation of the Lagrange multiplier field without damping is proposed. The antiferromagnetic long-range ordering is described without introducing an additional repulsive interaction. The theory suggests a natural framework to study spin disordered systems in which fermionic excitations are low-lying excitations.
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