Theoretical proposal for novel experimental probe of fractionalized excitations in two-dimensional quantum spin liquids

Experimental smoking-gun signature for quantum spin liquids, highly entangled quantum paramagnets hosting fractionalized excitations called spinons, is a long-sought holy grail of modern condensed matter research. As spin excitations decay into a pair of fractionalized quasiparticles, conventional experimental probes do not have the resolving power for each individual fractionalized excitation. In fact, they only show a broad continuum for the pair of spinons. In this talk, we discuss a novel experimental protocol to identify the sharp coherent signals of each of the individual spinons to disambiguate quantum spin liquids from trivial paramagnets or magnon excitations.