https://doi.org/10.1140/epjp/s13360-023-04744-1
Regular Article
Stability analysis of exciton, charged excitons, and biexciton in an InP/GaAs/GaSb type-II quantum dot heteronanostructure: a comparison of binding energy and diamagnetic susceptibility
Department of Metallurgical and Materials Engineering, Ahi Evran University, Kırşehir, Turkey
Received:
5
August
2023
Accepted:
24
November
2023
Published online:
18
December
2023
The present study focused on investigating the total energies, binding energies, and diamagnetic susceptibilities of excitons, negative and positive trions, and biexcitons within an InP/GaAs/GaSb type-II quantum dot heteronanostructure. The analysis has been carried out by varying the InP core radius, GaAs and GaSb layer thicknesses, and temperature. To obtain the energy levels and wavefunctions of the system, the Poisson–Schrödinger equation has been solved under the effective mass approximation and BenDaniel–Duke boundary conditions, considering the dielectric mismatch. The results of the calculations have revealed that while diamagnetic susceptibility could provide reliable information about the stability of the exciton, it has not offered the same level of accuracy when assessing the stability of the negative and positive trion and biexciton. Additionally, it has been observed that the dielectric mismatch effect can be influential, to the extent of reversing the expected trend in the binding energy, particularly when the GaAs layer thickness varies. On the other hand, the effect of temperature has been found to be limited and negligible due to the strong confinement of the quantum dot heteronanostructure.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
