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

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

1995-02-22

arxiv.org/abs/cond-mat/9502085v2

Phys. Rev. B 52, R715 (1995)

Physics

Condensed Matter

4 pages, RevTeX 3.0, 4 figures available on request

Scientific paper

10.1103/PhysRevB.52.R715

Inspired by the recent experiments on Y$_{2-x}$Ca$_x$BaNiO$_5$, (J. F. DiTusa {\it et al.}, Phys. Rev. Lett. 73, 1857 (1994)), we discuss the dispersion relation of the $s$=1/2 particles in the $s$=1 Heisenberg and VBS 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 four--fold and two two--fold degenarate bands. We briefly discuss the interaction between the $s$=1/2 particles arising from the background.

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