Dynamical thermal near-field routing with the non-reciprocal Weyl semi-metal Co$_3$Sn$_2$S$_2$

TL;DR

This paper theoretically investigates non-reciprocal near-field thermal routing using ferromagnetic Weyl semi-metal Co$_3$Sn$_2$S$_2$, revealing a spin-spin coupling mechanism that enables directional heat transfer at the nanoscale.

Contribution

It introduces a novel theoretical model demonstrating non-reciprocal thermal routing via Weyl semi-metal surface modes, highlighting potential for nanoscale thermal management.

Findings

Non-reciprocal heating effect reaches 22.5% of temperature differences.

Thermal routing is driven by spin-spin coupling between nanoparticles and substrate.

Results suggest feasibility for experimental realization and applications in thermal control.

Abstract

We demonstrate theoretically the non-reciprocal heating dynamics of two nanoparticles in the vicinity of a substrate all made of the ferromagnetic Weyl semi-metal Co$_3$Sn$_2$S$_2$. We show that the thermal routing effect is due to a spin-spin coupling mechanism between the nanoparticle 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 rounting effect paves the way for first experimental realizations employing Weyl semi-metals and applications in nanoscale thermal management.