Dynamical thermal near-field routing with the non-reciprocal Weyl semi-metal Co3Sn2S2

Abstract

We demonstrate theoretically the non-reciprocal heating dynamics of two nanoparticles (NPs) in the vicinity of a substrate, all made of the ferromagnetic Weyl semi-metal (WSM) Co3Sn2S2. We show that the thermal routing effect is due to a spin–spin coupling mechanism between the NP resonances and the non-reciprocal surface modes of the substrate. Our numerical results indicate that the non-reciprocal heating effect is on the order of 22.5% of the applied temperature differences. This strong routing effect paves the way for experimental realizations employing WSMs and applications in nanoscale thermal management.