Phys. Rev. B 52, R715–R718 (1995)Propagating S=1/2 particles in S=1 Haldane-gap systems
Inspired by the recent experiments on Y2-xCaxBaNiO5, we discuss the dispersion relation of the S=1/2 particles in the S=1 Heisenberg and valence bond solid model in the limit of small hopping amplitudes. The effective S=1/2 edge spins mix with the spin of the impurity resulting in one fourfold and two twofold degenerate bands. We briefly discuss the interaction between the S=1/2 particles arising from the background. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.52.R715
DOI:
10.1103/PhysRevB.52.R715
PACS:
75.10.Jm, 71.27.+a, 75.30.Hx
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