Propagating S=1/2 particles in S=1 Haldane-gap systems

Karlo Penc, Hiroyuki Shiba

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28 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)R715-R718
JournalPhysical Review B
Issue number2
Publication statusPublished - Jan 1 1995


ASJC Scopus subject areas

  • Condensed Matter Physics

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