Radiative Thermal Router Based on Tunable Magnetic Weyl Semimetals

We theoretically propose and numerically demonstrate a radiative thermal router based on magnetic Weyl semimetals. In designing the thermal router, we utilize two unique properties of optical gyrotropy in magnetic Weyl semimetals: great tunability and nanoscale inhomogeneity. The proposed thermal router consists of three spheres made of magnetic Weyl semimetals, one tunable and two fixed. It can direct a heat flow to a drain of choice by moving the Weyl nodes in the tunable magnetic Weyl semimetal using an external electric, magnetic, or optical field. Such a Weyl-semimetal-based radiative thermal router could enable exciting opportunities in energy harvesting and heat transfer applications.