Significant enhancement of dual-polarization nonreciprocity by twisted α-MoO3/Weyl semimetals heterostructure

The twisted α -MoO 3 has been widely utilized in the near-field radiative heat transfer, as well as the far-field thermal radiation. However, the valuable nonreciprocal thermal radiation between Weyl semimetals and twisted α -MoO 3 has yet to be investigated. In this work, the twisted α -MoO 3 /Weyl semimetals heterostructures separated by Ge dielectric layer are studied to find out the relationship between the twisted α -MoO 3 and the dual-polarization nonreciprocity. Through research on polarization conversions, the enhancement of dual-polarization nonreciprocity is confirmed to arise from the increment of discrepancy of the co-polarized reflectivity components, which depends on the twisted angles. The twisted α -MoO 3 breaks the mirror symmetry and rotational symmetry, providing nonreciprocal absorption effects for TE polarization. The study on electric field distributions reveals that the dual-polarization nonreciprocity arises from the excitation of Fabry–Perot modes in Ge dielectric layer. The proposed scheme incorporates twisted optics and nonreciprocal thermal radiation, which provides an effective solution for the design of the dual-polarization nonreciprocal thermal emitters.