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Novel states of matter in quantum magnets like quantum spin liquids attractconsiderable interest recently. Despite the existence of a plenty of candidatematerials, there is no confirmed quantum spin liquid, largely due to the lackof proper experimental probes. For instance, spectrosocopy experiments likeneutron scattering receive contributions from disorder-induced local modes,while thermal transport experiments receive contributions from phonons. Here wepropose a thermo-optic experiment which directly probes the mobile magneticexcitations in spatial-inversion symmetric and/or time-reversal symmetric Mottinsulators: the temperature-gradient-induced nonreciprocal directionaldichroism (TNDD) spectroscopy. Unlike traditional probes, TNDD directly detectsmobile magnetic excitations and decouples from phonons and local magneticmodes.

Nonreciprocal directional dichroism induced by a temperature gradient as a probe for mobile spin dynamics in quantum magnets