Systematic 1/S study of the two-dimensional Hubbard model at half-filling

Andrey V. Chubukov, Karen A. Musaelian

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18 Scopus citations

Abstract

The two-dimensional 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 (±π/2,±π/2). Relation to previous papers on the subject is discussed.

Original languageEnglish (US)
Pages (from-to)6238-6245
Number of pages8
JournalPhysical Review B
Volume50
Issue number9
DOIs
StatePublished - 1994

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