Twist-Induced Near-Field Thermal Switch Using Nonreciprocal Surface Magnon-Polaritons

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 a large twist-induced thermal switch ratio in large damping conditions and nonmonotonic twist manipulation for heat transfer in small damping conditions, associated with the different twist-induced effects of nonreciprocal elliptic surface magnon-polaritons, hyperbolic surface magnon-polaritons, and twist-nonresonant surface magnon-polaritons. Moreover, the near-field radiative heat transfer can be significantly enhanced by the twist-nonresonant surface magnon-polaritons in the ultrasmall damping condition. Such a twist-induced effect is applicable for other kinds of anisotropic slabs with time-reversal symmetry breaking. Our findings provide a way to twisted and magnetic control in nanoscale thermal management and improve it with twistronic concepts.