Modulation of Near-Field Radiative Heat Transfer between Weyl Semimetal/hBN Multilayers

Weyl semimetals (WSMs) have attracted a considerable amount of attention in many fields due to their appealing optical properties. In this work, we study the near-field radiative heat transfer (NFRHT) between two WSM/hBN multilayer structures to analyze the coupling of surface plasmons of WSMs and nonresonant hyperbolic modes. We find that the WSM/hBN multilayer structure not only combines the SPPs and ENZ effect of WSM plates and HMs of hBN plates but also yields HSPPs that play an important role in the enhancement of NFRHT. Hence, a high total HTC of 1.80 × 10 4 W K –1 m –2 at d = 10 nm can be achieved, which is 1.89 and 6.45 times higher than the values of the pure WSM and pure hBN cases, respectively. The Fermi level and number of Weyl nodes of WSM plates allow for high tunability of NFRHT of the system. The effects of geometry and the topmost layer material on NFRHT are also discussed. We hope that our findings are beneficial for thermal management in WSM-based systems at the nanoscale.