Insulating moiré homobilayers lack a threefold symmetric second harmonic generation

Luis Enrique Rosas-Hernandez, Jose Luis Cabellos, Angiolo Huamán +2

Atoms within moiré bilayers relax in-plane to minimize elastic energy [e.g., Cazeaux et al., J. Elast. 154, 443 (2023)]; such relaxation brings their space group symmetries down to…