Twist-induced Near-field Thermal Switch Using Nonreciprocal Surface Magnon-Polaritons

TL;DR

This paper demonstrates how twisting magnetic fields in ferromagnetic insulator slabs can control near-field radiative heat transfer via nonreciprocal surface magnon-polaritons, enabling thermal switching and enhanced heat transfer at the nanoscale.

Contribution

It introduces a novel twist-induced thermal switch mechanism leveraging nonreciprocal surface magnon-polaritons, expanding the control of nanoscale heat transfer with twistronics concepts.

Findings

Large twist-induced thermal switch ratio in high damping conditions.

Nonmonotonic heat transfer manipulation in low damping conditions.

Significant heat transfer enhancement via twist-non-resonant magnon-polaritons.

Abstract

We explore that two ferromagnetic insulator slabs host a strong twist-induced near-field radiative heat transfer in the presence of twisted magnetic fields. Using the formalism of fluctuational electrodynamics, we find the existence of large twist-induced thermal switch ratio in large damping condition and nonmonotonic twist manipulation for heat transfer in small damping condition, associated with the different twist-induced effects of nonreciprocal elliptic surface magnon-polaritons, hyperbolic surface magnon-polaritons, and twist-non-resonant surface magnon-polaritons. Moreover, the near-field radiative heat transfer can be significantly enhanced by the twist-non-resonant surface magnon-polaritons in the ultra-small damping condition. Such twist-induced effect is applicable for other kinds of anisotropic slabs with timereversal symmetry breaking. Our findings provide a way to twisted and magnetic control in nanoscale thermal management and improve it with twistronics concepts.