Exciton–polaritons in CsPbBr3 crystals revealed by optical reflectivity in high magnetic fields and two‐photon spectroscopy

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dc.contributor.authorYakovlev, Dmitri R.
dc.contributor.authorCrooker, Scott A.
dc.contributor.authorSemina, Marina A.
dc.contributor.authorRautert, Janina
dc.contributor.authorMund, Johannes
dc.contributor.authorDirin, Dmitry N.
dc.contributor.authorKovalenko, Maksym V.
dc.contributor.authorBayer, Manfred
dc.date.accessioned2025-04-03T07:30:39Z
dc.date.available2025-04-03T07:30:39Z
dc.date.issued2023-11-06
dc.description.abstractCesium lead bromide (CsPbBr3) is a representative material of the emerging class of lead halide perovskite semiconductors that possess remarkable optoelectronic properties. Its optical properties in the vicinity of the bandgap energy are greatly contributed by excitons, which form exciton polaritons due to strong light–matter interactions. Exciton–polaritons in solution-grown CsPbBr3 crystals are examined by means of circularly polarized reflection spectroscopy measured in high magnetic fields up to 60 T. The excited 2P exciton state is measured by two-photon absorption. Comprehensive modeling and analysis provides detailed quantitative information about the exciton–polariton parameters: exciton binding energy of 32.5 meV, oscillator strength characterized by longitudinal–transverse splitting of 5.3 meV, damping of 6.7 meV, reduced exciton mass of 0.18m0, exciton diamagnetic shift of 1.6 μeV T−2, and exciton Landé factor gx = +2.35. It is shown that the exciton states can be described within a hydrogen-like model with an effective dielectric constant of 8.7. From the measured exciton longitudinal–transverse splitting, Kane energy of Ep = 15 eV is evaluated, which is in reasonable agreement with values of 11.8–12.5 eV derived from the carrier effective masses.en
dc.identifier.urihttp://hdl.handle.net/2003/43588
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-25421
dc.language.isoen
dc.relation.ispartofseriesPhysica status solidi. Rapid research letters; 18(3)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCsPbBr3
dc.subjectexciton binding energiesen
dc.subjectexciton-polaritonsen
dc.subjecthigh magnetic fieldsen
dc.subjectLandé factorsen
dc.subjectperovkite semiconductorsen
dc.subjecttwo-photon spectroscopiesen
dc.subject.ddc530
dc.titleExciton–polaritons in CsPbBr3 crystals revealed by optical reflectivity in high magnetic fields and two‐photon spectroscopyen
dc.typeText
dc.type.publicationtypeResearchArticle
dcterms.accessRightsopen access
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationYakovlev, D.R., Crooker, S.A., Semina, M.A., Rautert, J., Mund, J., Dirin, D.N., Kovalenko, M.V. and Bayer, M. (2024), Exciton–Polaritons in CsPbBr3 Crystals Revealed by Optical Reflectivity in High Magnetic Fields and Two-Photon Spectroscopy. Phys. Status Solidi RRL, 18: 2300407. https://doi.org/10.1002/pssr.202300407
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1002/pssr.202300407

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