Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
Volume 36, Issue 23, Pages L351-L357Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/36/23/104
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We show that the one-dimensional spin-1 XY model has an additional SU(2) symmetry for the open boundary condition and for an artificial one. We can explain some degeneracies of excitation states which were reported in previous numerical studies.
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