Anisotropic radiative heat transfer between nanoparticles mediated by a twisted bilayer graphene grating

Twisted two-dimensional bilayers exhibit many intriguing physical phenomena through interlayer twisting and coupling. Manipulating the ``twisted angle'' between the two evanescently coupled layers enables the hybridization of polaritons, and the dispersion engineering of polaritons in these structures can be well controlled. In this paper, we study the near-field radiative heat transfer (NFRHT) between two nanoparticles in the presence of a bilayered hyperbolic metasurface, which is modeled as two arrays of graphene strips (GSs) in parallel. We prove that the topological transition of the surface state under different twisted angles [from open (hyperbolic) to closed (elliptical) contours] has significant effect on NFRHT between nanoparticles. When both the integral and interlayer twisted angles are adjusted to proper values, the bilayered GS can canalize the energy transmission channel of the nanoparticles, hence significantly amplifying the NFRHT. A modulation factor beyond five orders of magnitude is achieved. We also demonstrate that, when the nanoparticles are arranged in different directions along the twisted bilayered system, NFRHT between nanoparticles can be strongly enhanced or inhibited. By changing the chemical potential and filling factor of the twisted bilayered GS, NFRHT can be effectively modulated. This paper reveals a hybridization effect of polaritons on NFRHT between nanoparticles, giving a degree of freedom (twisted angle) for controlling the heat transfer at the nanoscale with potential for effective energy management.