Is the purely biquadratic spin 1 chain always massive?

Details Is the purely biquadratic spin 1 chain always massive? Is the purely biquadratic spin 1 chain always massive?

2000-12-22

arxiv.org/abs/cond-mat/0012439v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, Revtex

Scientific paper

It is shown that the sl(2)q-invariant open antiferromagnetic XXZ spin chain
with a boundary field has a gapless sector in the thermodynamic limit when its
length is odd. Owing to a Temperley-Lieb equivalence of the spectra, the same
conclusion is drawn for the purely biquadratic spin 1 chain with open
boundaries and odd length.

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