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PreprintarXiv licencearXiv

Coexisting Large and Small Polarons in Photoexcited CeO2

  • Valentina Mazzotti
  • Eleonora Spurio
  • Nicolas Delnour
  • Michael Hilke
  • Kirk H. Bevan
  • Alexander Shluger
  • Paola Luches
  • David G. Cooke
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Abstract

Time-resolved terahertz (THz) spectroscopy is used to probe polaron formation in CeO2. The ultrafast THz photoconductivity is dominated by contributions from large hole and small electron polarons. Delocalized large hole polarons are formed on a 820 ± 50 fs time scale and are of Fröhlich type, with optical conductivity well described by a simple Drude model and a transient hole mobility of $100$ cm2/Vs. Small electron polarons form via localized coupling to Ce lattice sites, revealed by reduction in the lattice Born effective charge causing a transient phonon softening. These results establish the dual polaron nature of CeO2 and provide a basis for understanding charge transfer dynamics in metal oxide photocatalysts.

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Cite

BibTeXRIS
BibTeX
@misc{mazzotti2026coexisting,
  title = {{Coexisting Large and Small Polarons in Photoexcited CeO$_2$}},
  author = {Valentina Mazzotti and Eleonora Spurio and Nicolas Delnour and Michael Hilke and Kirk H. Bevan and Alexander Shluger and Paola Luches and David G. Cooke},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.30164},
  eprint = {2608.30164},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.30164},
}
RIS
TY  - UNPB
TI  - Coexisting Large and Small Polarons in Photoexcited CeO_2
AU  - Valentina Mazzotti
AU  - Eleonora Spurio
AU  - Nicolas Delnour
AU  - Michael Hilke
AU  - Kirk H. Bevan
AU  - Alexander Shluger
AU  - Paola Luches
AU  - David G. Cooke
PY  - 2026
DA  - 2026/08/31
PB  - arXiv
DO  - 10.48550/arxiv.2608.30164
UR  - https://arxiv.org/abs/2608.30164
AB  - Time-resolved terahertz (THz) spectroscopy is used to probe polaron formation in CeO_2. The ultrafast THz photoconductivity is dominated by contributions from large hole and small electron polarons. Delocalized large hole polarons are formed on a 820 ± 50 fs time scale and are of Fröhlich type, with optical conductivity well described by a simple Drude model and a transient hole mobility of $100$ cm^2/Vs. Small electron polarons form via localized coupling to Ce lattice sites, revealed by reduction in the lattice Born effective charge causing a transient phonon softening. These results establish the dual polaron nature of CeO_2 and provide a basis for understanding charge transfer dynamics in metal oxide photocatalysts.
ER  -