Light stands still in a deformed crystal

https://phys.org/news/2024-04-deformed-crystal.html

"deforming 2D photonic crystal with regular hole pattern in silicon layer containing light... breaking this regularity in exactly right manner deforms array locking photons... similar effect on photons as magnetic field, insulator-like, on electrons... adjusting deformation pattern adjusts magnetic fields steer light concentration, strength, over entire crystal surface... stop light waves from moving, meaning Landau energy levels... nanophotonic chip development, efficient lasers or quantum light sources"