Near field radiative heat transfer in twisted bilayer graphene grating structures based on magnetic modulation

Abstract

Graphene grating structures have potential in enhancing near-field radiative heat transfer because of their anisotropic properties and single-layer graphene grating structures have shown excellent capability for thermal modulation in magnetic fields. In this study, a theoretical model for the near-field radiative heat transfer under the influence of a magnetic field in twisted bilayer graphene grating structures is proposed, in which there exists a rotation angle between bilayer graphene gratings. The emitter and absorber are mirror images of each other. The combined effect of the magnetic field and graphene chemical potentials on modulating near-field radiative heat transfer is investigated. The effect of the graphene grating filling factor on the surface state and the near-field radiative heat transfer is discussed. By manipulating the rotation angle of the graphene gratings, the magnetic field enhances thermal modulation. The hyperbolic and elliptic surface plasmon polaritons of the graphene gratings undergo topological transitions as the rotation angle increases.