Propagating S=1/2 particles in S=1 Haldane-gap systems
Abstract
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.
- Publication:
-
Physical Review B
- Pub Date:
- July 1995
- DOI:
- 10.1103/PhysRevB.52.R715
- arXiv:
- arXiv:cond-mat/9502085
- Bibcode:
- 1995PhRvB..52..715P
- Keywords:
-
- 75.10.Jm;
- 71.27.+a;
- 75.30.Hx;
- Quantized spin models;
- Strongly correlated electron systems;
- heavy fermions;
- Magnetic impurity interactions;
- Condensed Matter
- E-Print:
- 4 pages, RevTeX 3.0, 4 figures available on request