Manipulation of nonreciprocal radiative heat transfer in a two-body system composed of graphene-covered hBN metasurfaces

Active manipulation of near-field radiative heat transfer (NFRHT) has important application prospects in thermal management and energy conversion. In this paper, we explore nonreciprocal NFRHT in a two-body system, which consists of graphene-covered hexagonal boron nitride (hBN) metasurfaces. Our results indicate that the strong coupling between nonreciprocal surface plasmon polaritons (NSPPs) in graphene and hyperbolic phonon polaritons (HPPs) in the hBN metasurface confers a unique advantage to the use of a drift bias current for manipulating NFRHT. When the vacuum gap is below a specific threshold, increasing the drift current velocity enhances the heat transfer coefficient (HTC) by several times its initial value. Furthermore, numerical simulations reveal that variations in drift current velocity directly affect both the dispersion relationship and photon transmission coefficient (PTC) distribution of NSPPs, thereby enabling effective manipulation of NFRHT. Additionally, we examined how graphene's chemical potential and the filling fraction of hBN metasurfaces influence radiative heat transfer. Given the critical importance of diverse control strategies for NFRHT in micro‐ and nanoscale thermal radiation devices, we believe that this study serves as a valuable reference for advancing efficient thermal management systems.