Surface Exciton Polariton in Cesium Lead Halide Perovskites

IF 7.2 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Chemistry of Materials Pub Date : 2025-03-07 DOI:10.1021/acs.chemmater.4c03262

Jason Hao, Jeffrey Owrutsky, Daniel C. Ratchford, Blake Simpkins, Alexander L. Efros

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Abstract

In this article, we developed a theory describing surface exciton polaritons (SEPs) that accounts for the spatial dispersion of the dielectric constant connected with exciton momentum. Due to strong coupling between light and bulk excitons in the frequency separation, ℏω_LT, between the longitudinal and transverse excitons, the SEP is formed and behaves as partially light and partially matter. The dispersion of the SEP was found through a combined solution of Maxwell’s and Thomas-Hopfield’s equations. The analytical theory describes SEPs at any bulk exciton/vacuum interface and provides its complete dispersion if one knows ℏω_LT, the exciton effective mass, M, and the high-frequency dielectric constant, κ_∞. The presented theory is in excellent agreement with the only numerical modeling of this problem, which was conducted for SEPs at a ZnO/vacuum interface. Calculations show the spatial dispersion of the dielectric constant leads to rather small broadening of the photon-like quasi-particle and suggest using SEPs for long-range coherence transfer. The theory was used to describe SEP dispersion in CsPbCl₃ and CsPbBr₃ perovskites.

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来源期刊

Chemistry of Materials 工程技术-材料科学：综合

CiteScore

14.10

自引率

5.80%

发文量

929

审稿时长

1.5 months

期刊介绍： The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.