Abstract
The authors study the energy spectrum of a single spherical quantum dot of narrow-gap IV-VI material embedded within a host IV-VI material of different bandgap. The calculations of the energy levels as a function of the dot radius are performed. When the anisotropy is strong, the energy spectrum is investigated using Fal'kovskii's adiabatic approximation for multiband systems. When the quantum dot material has an inverted bandgap with respect to the host, low-energy edge states are shown to exist.
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