Spectrum of Low-Lying Excitations in a Supersymmetric Extended Hubbard Model

Details Spectrum of Low-Lying Excitations in a Supersymmetric Extended Hubbard Model Spectrum of Low-Lying Excitations in a Supersymmetric Extended Hubbard Model

1993-07-12

arxiv.org/abs/cond-mat/9307019v1

Int. J. Mod. Phys. B8, 3243 (1994)

Physics

Condensed Matter

37 pages, uuencoded compressed postscript file

Scientific paper

We continue the study of the $u(2|2)$-supersymmetric extension of the Hubbard model in one dimension. We determine the excitation spectrum at zero temperature even in the sectors where the ground states are $u(2|2)$-descendants of Bethe states. The excitations include spinons, holons, electrons, localons (local electrons pairs, moving coherently through the lattice) and their bound states. The spectra are found to be very different for repulsive and attractive on-site interaction. We also study the thermodynamics of the model.

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