Wavelength- and polarization-dependent enhancement of the magneto-optical effect with Al-doped 4H-SiC.

Al-doped 4H-SiC, a wide bandgap semiconductor, exhibits polarization rotation under a magnetic field similar to the magneto-optical effect after dressed-photon-phonon (DPP)-assisted annealing, which simultaneously irradiates the sample with a laser while applying a voltage. The magneto-optical effect exhibits wavelength- and polarization-dependence, which is attributed to the displacement of dopant clusters induced by DPP-assisted annealing. A significant enhancement of the magneto-optical response is observed when the incident light matches the DPP-assisted annealing conditions in wavelength and polarization. These findings suggest a promising route toward miniaturized optical devices in applications such as photonic computing or high-sensitivity sensing.