Systematic 1/S study of the 2D Hubbard model at half-filling
Condensed Matter
2009-10-22 v1
Abstract
The 2D Hubbard model is extended by placing 2S orbitals at each lattice site and studied in a systematic 1/S expansion. The 1/S results for the magnetic susceptibility and the spectra of spin-wave excitations at half-filling are consistent with the large S calculations for the Heisenberg antiferromagnet. The 1/S corrections to the fermionic spectrum lift the degeneracy along the edge of the magnetic Brillouin zone yielding minima at (+- pi/2, +- pi/2). Relation to previous papers on the subject is discussed.
Keywords
Cite
@article{arxiv.cond-mat/9402097,
title = {Systematic 1/S study of the 2D Hubbard model at half-filling},
author = {A. V. Chubukov and K. A. Musaelian},
journal= {arXiv preprint arXiv:cond-mat/9402097},
year = {2009}
}
Comments
18 pages, emTex version 3.0