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We consider the consequence of nonreciprocity in near-field heat transfer bystudying systems consisting of magneto-optical nanoparticles.We demonstratethat, in thermal equilibrium, a nonreciprocal many-body system in heat transfercan support a persistent directional heat current, without violating the secondlaw of thermodynamics. Such a persistent directional heat current cannot occurin reciprocal systems, and can only arise in many-body systems in heattransfer. The use of nonreciprocity therefore points to a new regime ofnear-field heat transfer for the control of heat flow in the nanoscale.

Persistent Directional Current at Equilibrium in Nonreciprocal Many-Body Near Field Electromagnetic Heat Transfer