Single-ion anisotropy in Haldane chains and form factor of the O(3) nonlinear sigma model

Shunsuke C. Furuya, Takafumi Suzuki, Shintaro Takayoshi +2

We consider spin-1 Haldane chains with single-ion anisotropy, which exists in known Haldane chain materials. We develop a perturbation theory in terms of anisotropy, where magnon-m…