Effect of a Staggered Magnetic Field on the S=1 Haldane Chain with Single-ion Anisotropy
arXiv:cond-mat/0206288 · doi:10.1016/S0375-9601(02)01054-X
Abstract
We analyze the gaps in the excitation spectrum of a Haldane chain with single-ion anisotropy in a staggered field. We show that the gap along the direction of the field increases at a faster rate than the others, while its spectral weight decreases, being transferred to a two-magnon continuum.
11 pages, 5 figures (.eps), LaTex