New paper from Mandeep and Rez on SHG from bulk centrosymmetric media

Relaxing Symmetry Rules for Nonlinear Optical Interactions in Van der Waals Materials via Strong Light–Matter Coupling
Mandeep Khatoniar, Rezlind Bushati, Ahmed Mekawy, Florian Dirnberger, Andrea Alù, and Vinod M Menon