Critical exponents of a multicomponent anisotropic t-J model in one dimension
Abstract
A recently presented anisotropic generalization of the multicomponent supersymmetric model in one dimension is investigated. This model of fermions with general spin- is solved by Bethe ansatz for the ground state and the low-lying excitations. Due to the anisotropy of the interaction the model possesses massive modes and one single gapless excitation. The physical properties indicate the existence of Cooper-type multiplets of fermions with finite binding energy. The critical behaviour is described by a conformal field theory with continuously varying exponents depending on the particle density. There are two distinct regimes of the phase diagram with dominating density-density and multiplet-multiplet correlations, respectively. The effective mass of the charge carriers is calculated. In comparison to the limit of isotropic interactions the mass is strongly enhanced in general.
Keywords
Cite
@article{arxiv.cond-mat/9409092,
title = {Critical exponents of a multicomponent anisotropic t-J model in one dimension},
author = {R. Z. Bariev and A. Klümper and A. Schadschneider and J. Zittartz},
journal= {arXiv preprint arXiv:cond-mat/9409092},
year = {2009}
}
Comments
10 pages, 3 Postscript figures appended as uuencoded compressed tar-file to appear in Z. Phys. B, preprint Cologne-94-4744