Data Repository: Confinement of Fractional Excitations in a Triangular Lattice Antiferromagnet

What was previously thought of as a broad excitation continuum [L. Facheris et al., Phys. Rev.

Lett. 129, 087201 (2022)] is shown to be a series of dispersive bound states reminiscent of “Zeeman ladders” in quasi-one-dimensional Ising systems. At wave vectors where interchain interactions cancel at the mean field level, they can indeed be interpreted as bound finite-width kinks in individual chains. Elsewhere in the Brillouin zone their true two-dimensional structure and propagation are revealed.