We construct a microscopic spin-exchange Hamiltonian for the quasi–one-dimensional (1D) Ising magnet CoNb2O6 that captures detailed and hitherto-unexplained aspects of its dynamic spin structure factor. We perform a symmetry analysis that recalls that an individual Ising chain in this material is buckled, with two sites in each unit cell related by a glide symmetry. Combining this with numerical simulations benchmarked against neutron scattering experiments, we argue that the single-chain Hamiltonian contains a staggered spin-exchange term. We further argue that the transverse-field–tuned quantum critical point in CoNb2O6 corresponds to breaking this glide symmetry, rather than an on-site Ising symmetry as previously believed. This gives a unified microscopic explanation of the dispersion of confined states in the ordered phase and quasiparticle breakdown in the polarized phase at high transverse field.

我们为准一维（1D）Ising磁体构造了一个微观自旋交换哈密顿量 CØñb2Ø6捕获了其动态自旋结构因子的详细和迄今无法解释的方面。我们进行对称分析，使人想起该材料中的单个Ising链是弯曲的，每个晶胞中的两个位点通过滑行对称性关联。结合以中子散射实验为基准的数值模拟，我们认为单链哈密顿量包含一个交错的自旋交换项。我们进一步认为，横向场调谐的量子临界点在CØñb2Ø6对应于打破这种滑行对称性，而不是先前认为的现场Ising对称性。这给出了在高横向电场下有序态的受限状态的分散和极化相中的准粒子分解的统一微观解释。