Anomalous refractive index modulation and giant birefringence in 2D ferrielectric CuInP${}_2$S${}_6$

Houssam El Mrabet Haje, Roald J. H. van der Kolk, Trent M. Kyrk +1

2D ferroelectric (FE) materials have opened new opportunities in non-volatile memories, computation and non-linear optics due to their robust polarization in the ultra-thin limit a…