Electron and hole spectra in -HgS cylindrical quantum wire superlattice in -CdS matrix are calculated within the method of augmented plane waves. The energy term determined by the movement of quasiparticles in direction perpendicular to the axial axis of the wire is presented by the alternating zones with a positive and a negative effective mass. The degeneration on the magnetic quantum number outside ¡ point of Brillouin zone is taken off when the potential of the superlattice quantum wires is taken into account. The ground zones energy dependence of plane quasiparticle movement on the radii of the quantum wires as well as the distance between the wires are investigated.
The electronic spectrum in a cylindrical CdS/[3-HgS semiconductor heterosystem of the quantum wire type located in an H20 dielectric medium is investigated. In the energy interval where the levels of both potential wells merge, there is a repulsion effect on the levels (a "bottleneck" effect). The nonmonotonic dependence of the electron and hole spectra on the thickness of the 13-HgS film means that in experiments there is an instability of the energy position of the exciton lines in a certain frequency range.Semiconductor heterojunction structures on the nanometer scale are important objects of study in the physics of solids in connection with the possibility of using them in laser systems. The wide choice of materials and system geometries (symmetry, quantity, thickness, arrangement, etc., of the layers) allows one to prepare heterosystems which are unique in their properties with special properties qualitatively different from those which occur in uniform materials. There is significant interest in studies of quasi-one-dimensional (quantum wire) and zero-dimensional (quantum dot) heterostructures [1-5] since in these systems one can observe such unique optical and transport properties as increased optical nonlinearity and high conductivity for individual quasiparticles and collective excitations.Simple heterosystems have been investigated in the vast majority of the papers --semiconductor nanocrystals in a dielectric medium. However, in recent years experimental and theoretical papers have appeared in which not only complex (multilayer) planar heterosystems are studied [6] but also spherical ones [7,8]. In particular in [7] the spherical heterosystem CdS//~-HgS/CdS/H20 was experimentally created for which the main electron and exciton energy levels were studied as a function of the thicknesses of the films in the system. Since such a heterosystem can be created experimentally in the form of cylindrical wires superimposed on each other, there is interest in studying the electronic spectrum of such a quasi-onedimensional system. The aim of the present paper is to study the electronic spectrum in a cylindrical CdS/5-HgS/H20 nanoscale heterosystem.
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