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The theoretical investigation of the electron and hole spectra in a quantum dot with a linearly graded composition within the effective mass approximation is presented. The particular example is beta-HgS surrounded by CdS. beta-HgS core of radius r(C) is surrounded by concentric spherical layers each of Hg1-xCdxS composition (x is function of r) and finally, form radius r(S) by CdS. The existence of these intermediate layers as model of graded composition, influences rapidly electron and hole spectra.

Electron and Hole States in Closed Spherical Quantum Dot with Linearly Graded Composition