Electrons, holes, and excitons in a superlattice composed of cylindrical quantum dots with extremely weak coupling between quasiparticles in neighboring layers of quantum dots

Abstract

The spectrum of electrons, holes, and excitons in a superlattice composed of cylindrical quantum dots with extremely weak coupling between quasiparticles in neighboring layers of quantum dots was studied theoretically. Calculations were performed for the example of cylindrical β-HgS quantum dots embedded in β-CdS in the form of a superlattice. It is shown that electrons and holes in such a system form quasi-two-dimensional energy minibands, whereas excitons can be described in terms of the Shinoda-Sugano model. The dependence of the quasiparticle spectra on geometric parameters of a superlattice with cylindrical quantum dots was studied. It is shown that the positions of minibands for all quasiparticles are very sensitive to the height of quantum dots, which should manifest itself in the experimental excitonic absorption spectrum.