Authors
Ioannis Chatzakis, Timur Abdilov, Elliott Walker, Jaime Freitas, Song Liu, James H Edgar
Published in
Physical review letters. Volume 137. Issue 5. Pages 056904. Jul 31, 2026.
Abstract
Exciton-phonon interactions play a central role in defining the optical response of hexagonal boron nitride (hBN), yet their quantitative determination has remained incomplete. Here, we reveal the Fröhlich-type exciton-phonon coupling in boron-10-enriched hBN using low-temperature cathodoluminescence. We resolve the indirect exciton 5.95±0.02 eV together with its longitudinal optical phonon replica detuned by 184±56 meV, enabling the extraction of a Fröhlich-coupling constant α=0.159, and a larger exciton binding energy of 161 meV, larger than previously reported values for natural abundance hBN, which is attributed to isotope enrichment. The inferred polaron radius exceeds the lattice constant, indicating large-polaron behavior. We deduced an exciton scattering time ∼97 fs (homogeneous linewidth ∼6.76 meV), a polaron binding energy of magnitude ∼48 meV, and an effective mass of 1.045 m_{0}. These results provide a direct quantitative characterization of exciton-phonon coupling in isotopically engineered hBN and establish a foundation for tailoring its phonon-polaritonic and quantum-optical properties.
PMID:
42606442
Bibliographic data and abstract were imported from PubMed on 17 Aug 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 17
- Comments 0