Electronic and optical properties of InAs/InAs0.625Sb0.375 superlattices and their application for far-infrared detectors
| العنوان: | Electronic and optical properties of InAs/InAs0.625Sb0.375 superlattices and their application for far-infrared detectors |
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| المؤلفون: | Ghulam Hussain, Giuseppe Cuono, Rajibul Islam, Artur Trajnerowicz, Jarosław Jureńczyk, Carmine Autieri, Tomasz Dietl |
| المصدر: | Journal of Physics D: Applied Physics. 55:495301 |
| بيانات النشر: | IOP Publishing, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Condensed Matter - Other Condensed Matter, Condensed Matter - Materials Science, Condensed Matter::Materials Science, Acoustics and Ultrasonics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Condensed Matter Physics, Other Condensed Matter (cond-mat.other), Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials |
| الوصف: | We calculate the electronic and optical properties of InAs/InAs$_{0.625}$Sb$_{0.375}$ superlattices within relativistic density functional theory. To have a good description of the electronic and optical properties, the modified Becke-Johnson exchange-correlation functional is pondered to correctly approximate the band gap. First, we analyze electronic and optical characteristics of bulk InAs and InSb, and then we investigate the InAs/InAs$_{0.625}$Sb$_{0.375}$ superlattice. The optical gaps deduced from the imaginary part of the dielectric function are associated with the characteristic interband transitions. We investigate the electronic and optical properties of the InAs/InAs$_{0.625}$Sb$_{0.375}$ superlattice with three lattice constants of the bulk InAs, GaSb and AlSb, respectively. It is observed that the electronic and optical properties strongly depend on the lattice constant. Our results support the presence of two heavy-hole bands with increasing in-plane effective mass as we go far from the Fermi level. We notice a considerable decrease in the energy gaps and the effective masses of the heavy-holes in the k$_x$-k$_y$ plane compared to the bulk phases of the parent compounds. We demonstrate that the electrons are s-orbitals delocalized in the entire superlattice, while the holes have mainly 5p-Sb character localized in the In(As,Sb) side of the superlattice. In the superlattice, the low-frequency absorption spectra greatly increase when the electric field is polarized orthogonal to the growth axis allowing the applicability of III-V compounds for the long-wavelength infrared detectors. Comment: 11 figures, 13 pages |
| تدمد: | 1361-6463 0022-3727 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be47154ebd69414ca300f41ba293945d https://doi.org/10.1088/1361-6463/ac984d |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....be47154ebd69414ca300f41ba293945d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13616463 00223727 |
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