Topologically enhanced optical helicity density in the thermal near field of twisted bilayer van der Waals materials

Xiaohong Zhang, Chiyu Yang, Wenshan Cai +1

Twisted van der Waals (vdW) bilayers can support tunable surface/hyperbolic phonon polariton (S/HPhP) depending on the interlayer twist angle. S/HPhPs can be thermally excited and…