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VOLUME 63 (1996) | ISSUE 3 | PAGE 192
Spin gap for multicham lattice and linearized near Fermi points quantum spin model
We have shown using exact Bethe ansatz solution that for a multichain quantum antiferromagnetic spin S—l/2 syatem an excitation energy has a gap for the linearized near Fermi points case of the model and it is gapless for its lattice analog. The result is generalized for multichain spin S quantum antiferromagnet and for strongly correlated electron models with "permutation" construction of supersymmetric Hamiltonians.