Chromium sulfide bromide layered quantum material with magnetic order/ exciton dominated optics highly sensitive to magnetic fields

https://phys.org/news/2025-07-ultra-small-optical-devices-rewrite.html#google_vignette

"applying modest magnetic field induces giant continuous/ reversible optical mode refractive index shift enabling photonic crystals up to order magnitude thinner (6 nm)... leads to the formation of polaritons enabling enhanced nonlinearities/ new quantum light transport regimes... ultra-small optical devices enabling external manipulation capable of achieving at -222°F: quantum simulation, nonlinear optics, reconfigurable polaritonic platforms"