Hidden Domain Walls as Elementary Excitations in the Spin-1 Valence-Bond-Solid Model
G. Fáth and J. Sólyom
Research Institute for Solid State Physics, P.O. Box 49, 1525 Budapest, Hungary
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Low-energy excitations are studied in the 1D S = 1 antiferromagnetic valence-bond-solid model. The lowest states are found to form a discrete triplet branch, separated from a higher-lying scattering continuum. The elementary excitations are argued to be "hidden" domain walls.
DOI: 10.12693/APhysPolA.85.371
PACS numbers: 75.10.Jm