THE MAGNETIC FIELD EFFECT ON THE OPTICAL PROPERTIES ОF TYPE II QUANTUM DOTS (AHARONOV – BOHM EFFECT)
DOI:
https://doi.org/10.32782/pet-2023-3-3Keywords:
quantum dots, type II heterojunction, magnetic field, energy spectrum of quasiparticles, oscillator strength of quantum transitions, ground state oscillations, Aharonov –Bohm effectAbstract
Due to the spatial separation of electrons and holes in core/shell semiconductor QDs with a type II heterojunction, new optical properties unavailable in other QDs can be manifested. Therefore, such nanosystems are intensively studied for the possibility of use in new nanodevices. The purpose of this work is to determine the influence of the magnetic field on the energy structure and interband optical quantum transitions in spherical quantum dots of type II ZnTe/CdSe and CdSe/ZnTe. The problem was solved by two methods: the finite element method in the COMSOL Multiphysics system and the diagonalization method in the Wolfram Mathematica system based on exact solutions of the Schrödinger equation in a system undisturbed by a magnetic field. The results obtained by both methods coincide with great accuracy. The last method is more complicated, but it made it possible to determine the partial contribution of the basic states in the new quantum states of quasiparticles obtained as a result of the action of a magnetic field. The dependence of the energy spectra and wave functions of the electron and hole on the magnetic field for spherical quantum dots ZnTe/CdSe and CdSe/ZnTe with different core sizes was obtained in the paper. It is shown that the magnetic field breaks the spherical symmetry of the system and removes the degeneracy of the energy spectrum according to the magnetic quantum number. The energy of quasiparticles in states with m ≥ 0 increases monotonically with increasing magnetic field, and in states with m < 0 these dependences are non-monotonic. The energy of the ground state of the electron in ZnTe/CdSe and the energy of the ground state of the hole in CdSe/ ZnTe with increasing induction of the magnetic field are alternately formed by the lowest states 0, 1, 2, ... . This is a consequence of the Aaronov – Bohm effect in core/shell CT. It is shown that the magnetic field deforms the wave functions of quasiparticles and affects the amount of their overlap. This is manifested in the dependence of the oscillator strength of interband quantum transitions on the induction of the magnetic field. It is shown that the Aaronov – Bohm effect can manifest itself in interband quantum transitions.
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