Electric field effect on the intersubband optical absorption of GeSn quantum wells with parabolically graded barriers

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dc.contributor.authorYahyaoui, N.
dc.contributor.authorBaser, P.
dc.contributor.authorSaid, M.
dc.contributor.authorSaadaoui, S.
dc.date.accessioned2024-10-26T18:09:55Z
dc.date.available2024-10-26T18:09:55Z
dc.date.issued2023
dc.departmentSivas Cumhuriyet Üniversitesi
dc.description.abstractIn this study, we propose a theoretical simulation of a Ge0.9Sn0.1 rectangular SQW with GeSn parabolically graded barriers (PGBs) in the terahertz (THz) region. The discrete intra-band confined energy levels and their matching wave functions were calculated by solving the stationary Schr & ouml;dinger equation by the finite difference method taking into account the Compact Density Matrix approach under the framework of both the effective mass and the envelope wave function approximations. In this work, we studied the effect of the quantum square-well width on the intersubband transition and oscillator strength in a GeSn-strained-based Barrier-Well-Barrier GeSn/(Ge,alpha-Sn) PGBs to obtain the optimum quantum confinement of electrons. The electronic states and their wave functions in the conduction band were computed by solving the Schr & ouml;dinger equation without and under the effect of an applied external electric field at room temperature. We then investigated the effect of the electric field on the optical absorption coefficient (OAC). Our numerical results show that for external fields (>15 kV/cm), an intersubband transitions (ISBTs) frequency band of 2-14 THz (8-58 meV) was obtained for the specific optimized parameters. These results should be beneficial to the design of devices based on GeSn QWs with PGB structures operating in the THz frequency range.
dc.description.sponsorshipDeanship of Scientific Research at King Khalid University [RGP2/19/44]
dc.description.sponsorshipThe authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through a large group Research Project under grant number RGP2/19/44.
dc.identifier.doi10.1016/j.micrna.2023.207682
dc.identifier.issn2773-0123
dc.identifier.scopus2-s2.0-85174681861
dc.identifier.scopusqualityN/A
dc.identifier.urihttps://doi.org/10.1016/j.micrna.2023.207682
dc.identifier.urihttps://hdl.handle.net/20.500.12418/30342
dc.identifier.volume184
dc.identifier.wosWOS:001110399400001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherAcademic Press Ltd- Elsevier Science Ltd
dc.relation.ispartofMicro and Nanostructures
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectTerahertz region
dc.subjectGeSn parabolically graded barriers (PGBs)
dc.subjectIntersubband transitions
dc.subjectOptical absorption coefficient
dc.subjectQuantum-confined Stark effect
dc.titleElectric field effect on the intersubband optical absorption of GeSn quantum wells with parabolically graded barriers
dc.typeArticle

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