Proceedings PaperPhotoemission from superlattices of nonlinear optical materials with graded structures under strong magnetic field
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In this paper, an attempt is made to investigate the photoemission from superlattices of nonlinear optical materials with graded interface in the presence of a strong magnetic field within the framework of k.p formalism by considering various types of anisotropies of the energy spectrum. We have also compared the same emission from the constituent materials by formulating the respective expressions. It is found by considering CdGeAs2/Cd3As2SL as an example that the magneto photoemission exhibits oscillatory magnetic field dependences, due to the SdH effect and increases with increasing photon energy in a ladder- like manner. The theoretical formulation is in quantitative agreement with experimental observations reported elsewhere. In addition, the well-known expressions for the photo- emission from relatively wide band-gap non-degenerate materials have also been obtained from the present generalized theoretical analysis under certain limiting conditions.