Magneto-optics describes the interaction of light and matter in the presence of an external of internal magnetic field. It includes Faraday-rotation effect, Magneto-optical Kerr effect, Zeeman effect, Cotton-Mouton Effect, and magnetic circular dichroism. These effects are closely related to the surface/bulk magnetization, the crystal field symmetry, the carrier localization, and the generally spin-orbital-lattice interaction.

In WHMFC, we investigate various physical processes by using these magneto-optical effects, including the carrier dynamics in semiconductor nano-materials, the localized states in rare-earth luminescent materials, and the magnetization of frustrated or multiferroic magnets. In the presence of a 50 T pulsed magnetic field and temperature as low as 4.2 K, the magneto-optical effects are magnified, and new physics or application can be explored.

Figure 1. Detection of local crystal field and magnetic field by using the Zeeman effect of photoluminescence in Eu3+doped YVO4 and GdVO4 single crystals.(J. Mater. Chem. C 1, 7608 (2013), J. Appl. Phys. 117, 055902 (2015))

Figure 2. Diamagnetic shift in the GaNAs epitaxy layer (J. Alloy Compd. 2017, 699: 297)