Excitation Spectrum of Antiferromagnetic Rings
- 10 July 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 171 (2) , 572-574
- https://doi.org/10.1103/physrev.171.572
Abstract
Recently, Kawasaki proved that the biperiodicity of the dispersion relation obtained by des Cloizeaux and Pearson for the lowest triplet excitations of the Heisenberg antiferromagnetic ring is required by symmetry. This degeneracy is shown not to be a consequence of any symmetry of the Hamiltonian which has been noticed; it therefore appears to be accidental.Keywords
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