  Mesonic bound states of domain walls can be stabilized in quasi
one-dimensional magnetic compounds. Here, we theoretically study the Raman
light scattering response of a twisted Kitaev chain with tilted magnetic fields
as a minimal model for confinement in $\text{CoNb}_{2}\text{O}_{6}$. By both
numerical matrix product states and few-domain wall variational states, we show
that confinement-induced bound states directly manifest themselves as sharp
peaks in the Raman response. Near quantum criticality the Raman spectrum
exhibit the famous E$_{8}$ symmetry. Remarkably, by tuning the polarization of
the incident light field, we demonstrate that the Raman response offers new
insights into the intrinsic structure of the bound state wavefunction.

Strongly Correlated Electrons;Mesoscale and Nanoscale Physics