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Condensed Matter > Mesoscale and Nanoscale Physics

arXiv:2307.07035 (cond-mat)
[Submitted on 13 Jul 2023]

Title:Exciton-polaritons in CsPbBr$_3$ crystals revealed by optical reflectivity in high magnetic fields and two-photon spectroscopy

Authors:Dmitri R. Yakovlev, Scott A. Crooker, Marina A. Semina, Janina Rautert, Johannes Mund, Dmitry N. Dirin, Maksym V. Kovalenko, Manfred Bayer
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Abstract:Cesium lead bromide (CsPbBr$_3$) 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 band gap energy are greatly contributed by excitons, which form exciton-polaritons due to strong light-matter interactions. We examine exciton-polaritons in solution-grown CsPbBr$_3$ crystals 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-tranverse splitting of 5.3 meV, damping of 6.7 meV, reduced exciton mass of $0.18 m_0$, exciton diamagnetic shift of 1.6 $\mu$eV/T$^2$, and exciton Landé factor $g_X=+2.35$. We show that the exciton states can be well described within a hydrogen-like model with an effective dielectric constant of 8.7. From the measured exciton longitudinal-transverse splitting we evaluate the Kane energy of $E_p=15$ eV, which is in reasonable agreement with values of $11.8-12.5$ eV derived from the carrier effective masses.
Comments: 16 pager, 7 figures
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as: arXiv:2307.07035 [cond-mat.mes-hall]
  (or arXiv:2307.07035v1 [cond-mat.mes-hall] for this version)
  https://doi.org/10.48550/arXiv.2307.07035

Submission history

From: Marina Semina [view email]
[v1] Thu, 13 Jul 2023 19:25:33 UTC (1,176 KB)
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