Spectroscopy of spinons in quantum spin ice

We calculate the effect of the emergent photon on spectroscopic cross-sections of spinons in quantum spin ice which realizes an emergent phase of QED at low energies. We show that the photon drastically modifies threshold cross-sections of spinons from a naive density of states analysis resulting in effects such as an analogue of the Sommerfeld enhancement. We point out signatures in neutron scattering and Raman spectroscopy and show that this explains some recent numerical and experimental results.