Exciton-Resolved Phonon Coupling and Energy Dissipation Pathways in CsPbBr₃.

Authors

Pradeepa H L, Sagnik Chatterjee, Sayantan Patra, Swapneswar Bisoi, Saqlain Mushtaq, Hardeep, Akshay Singh, Ashish Arora, Atikur Rahman

Published in

ACS nano. Jun 27, 2026. Epub Jun 27, 2026.

Abstract

Exciton-phonon interactions govern the optical response of semiconductors, yet disentangling multiple coupling channels in lead halide perovskites remains challenging. We investigate CsPbBr₃ microcrystals using photoluminescence, Raman, and reflectance spectroscopy at low temperature, revealing the simultaneous presence of high-energy and Rashba excitons, each accompanied by distinct phonon replica series. High-energy exciton replicas are uniquely spaced by approximately 9 meV, whereas Rashba exciton replicas exhibit a characteristic approximately 6 meV spacing, indicating the specificity of the exciton-phonon coupling. k-means clustering applied to a large low-temperature photoluminescence data set reveals these replica features are prevalent. With increasing temperature, replica features broaden and merge, evolving into a dominant longitudinal optical phonon coupling regime at room temperature. This work establishes direct spectroscopic evidence for concurrent, exciton-specific phonon coupling within a single material, offering pathways to engineer light-matter interactions for optoelectronic and phonon-photon-based quantum device applications.

PMID:
42363904
Bibliographic data and abstract were imported from PubMed on 27 Jun 2026.

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