On the continuum 'spin-wave' spectrum of the one-dimensional Hubbard model
- 30 January 1982
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 15 (3), 521-528
- https://doi.org/10.1088/0022-3719/15/3/017
Abstract
The authors re-examine the triplet (S=1) 'spin-wave' excitations of the exactly solvable spin-1/2 1D Hubbard chain. They indicate that a continuous spectrum exists for all couplings U. In the strong coupling U to infinity limit, the spin-wave continuum spectrum of the isotropic Heisenberg antiferromagnet is recovered, for the half-filled band. Results for the quarter-filled band are also obtained by numerical solution of a set of linear integral equations. In addition they compare the particle-hole spectrum obtained by Coll (1974) with the Stoner excitations for a spiral spin density wave Hartree-Fock theory and found good qualitative agreement.Keywords
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