Inverse Spin Thermal Hall Effect in Nonreciprocal Photonic Systems

A transverse radiative heat flux induced by the gradient of spin angular momentum of photons in nonreciprocal systems is predicted. This thermal analog of the inverse spin Hall effect is analyzed in magneto-optical networks exhibiting $C4$ symmetry, under the action of spatially variable external magnetic fields. This finding opens new avenues for thermal management and energy conversion with nonreciprocal systems through a localized and dynamic control of the spin angular momentum of light.