Magneto-luminescence

Key words Photoluminescence, magneto-luminescence, Zeeman effect, g-factor, excitons, valence band symmetry... 

Theoretical calculations predict significant anisotropy in effective hole masses for the different valence bands of GaN, though the various calculations differ in the predicted magnitude of the anisotropy in each band [113-115]. Direct measurements of hole masses are, however, very difficult and most reported experimental values are indeed inferred from luminescence, magneto-optical studies of exciton luminescence, infrared reflectance and transmittance studies of polar materials, which are often isotropically averaged and thus not informative about the anisotropy. Directionally dependent Hall-effect measurements in m-plane GaN films grown on m-plane SiC substrates... 

Lanthamun is widely used in many fields, such as catalytic materials, piezoelectric materials, electric materials, thermoelectric materials, magneto resistive materials, luminescent materials (blue powder), hydrogen storage materials, optical glass, laser materials, and a variety of alloys materials and so on. In addition, many scientists assigned the role of lanthanum on crops as the "super calcium". This chapter mainly discusses the application of lanthanum in the field of catalytic materials. To date, lanthanum in the application of catalytic materials is mainly used as some components of the catalysts or additives to promote the catalytic properties. As a single lanthanum, the catalytic activity is... 

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