Significantly Reduced Rotation Frequency for Controlling Near-Field Heat Transfer between Rotating Objects by a Nonreciprocal Substrate

Reversing near-field thermal radiation between a rotating pair of hot and cold dipolar objects has recently been theoretically reported at low temperature. We demonstrate that such a reversal between two indium antimonide (InSb) nanoparticles occurs at lower rotation frequency at room temperature under an external magnetic field. Additionally, a nearby InSb substrate significantly relaxes the requirement of high rotation by acting as a heat sink and exciting surface modes that couple with particle resonances, both of which are tuned by the magnetic field. Our results provide a critical understanding about reversing near-field heat transfer between nanostructures with reduced rotation frequency, pointing to the possibility of experimental observation of heat reversal around room temperature.