Twist-Induced Near-Field Radiative Heat Switch in Hyperbolic Antiferromagnets

We study the twist-induced control of the near-field radiative heat transfer between two hyperbolic antiferromagnetic insulators under external magnetic fields. We show that the near-field heat flux can be affected by both the twist angle $\ensuremath{\theta}$ and the magnitude of the applied magnetic field with different broken symmetries. Irrespective of the twist angle, the external magnetic field causes the radiative heat flux to change nonmonotonically, and the minimum heat flux can be found with magnetic fields of approximately 1.5 T. Such nonmonotonic behavior is because the magnetic field can radically change the nature of the magnon polaritons with time-reversal symmetry breaking. The field not only affects the topological structure of surface magnon polaritons but also induces volume magnon polaritons that progressively dominate the heat transfer as the field increases. We further propose a twist-induced thermal switch device with inversion symmetry breaking, which can strongly regulate radiative heat flux through different magnetic fields. Our findings account for a characteristic modulation of radiative heat transfer with implications for applications in efficient thermal management.