We investigate the nature of the excitations captured by the dynamical response of XYZ triangular spin-1/2 ladders. We complement experimental inelastic neutron scattering results on the compound Cs2CoBr4 with numerically exact simulations based on time-dependent matrix product state methods. Our results show that bound states of spinon excitations can arise in XYZ beyond the requirement of strong Ising anisotropies. We analyze the role of the frustrated triangular couplings on the excitations giving rise to the spin dynamical structure factor and show how the features of the bound states manifest themselves in the different polarization channels.
@article{arxiv.2508.17834,
title = {Zeeman Ladders in Frustrated XYZ Spin Chains},
author = {Catalin-Mihai Halati and Viola Romerio and Paul Steffens and J. Ross Stewart and Andrey Zheludev and Thierry Giamarchi},
journal= {arXiv preprint arXiv:2508.17834},
year = {2025}
}