# 理論セミナー：Boundary bound states in spin-1/2 antiferromagnetic chains

こんなのがあるそうです。

We point out that a spin-1/2 antiferromagnetic Heisenberg chain with a staggered magnetic field can be described by an integrable field theory even in the presence of the boundary, and its exact solution contains the “boundary bound states”.We identify the previously unaccounted resonances observed in ESR spectra of KCuGaF6 and Cu-PM, with the boundary bound states.This might be the first experimental observation of the boundary bound states.