Spin excitations in the integrable open quantum group invariant supersymmetric t-J model

Details Spin excitations in the integrable open quantum group invariant supersymmetric t-J model Spin excitations in the integrable open quantum group invariant supersymmetric t-J model

1996-11-04

arxiv.org/abs/cond-mat/9611013v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, no ps figures, latex file

Scientific paper

10.1016/S0550-3213(97)00106-5

The integrable quantum group $spl_q(2,1)$-invariant supersymmetric t-J model with open boundaries is studied via an analytic treatment of the Bethe equations. An $su(2)$ feature is seen to hold for states at or close to half-filling. For these states the eigenvalues of the transfer matrix of the t-J model satisfy a set of $su(2)$ functional relations. The finite-size corrections to the relevant eigenvalues, and thus the surface effect on the spin excitations, have been calculated analytically by solving the functional relations.

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