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Critical exponents of a multicomponent anisotropic t-J model in one dimension | R. Z. Bariev
; A. Klümper
; A. Schadschneider
; J. Zittartz
; | Date: |
21 Sep 1994 | Subject: | cond-mat | Abstract: | A recently presented anisotropic generalization of the multicomponent supersymmetric $t-J$ model in one dimension is investigated. This model of fermions with general spin-$S$ is solved by Bethe ansatz for the ground state and the low-lying excitations. Due to the anisotropy of the interaction the model possesses $2S$ massive modes and one single gapless excitation. The physical properties indicate the existence of Cooper-type multiplets of $2S+1$ fermions with finite binding energy. The critical behaviour is described by a $c=1$ 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. | Source: | arXiv, cond-mat/9409092 | Services: | Forum | Review | PDF | Favorites |
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