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Peer-reviewedCC BYACS photonics

Sub-Picosecond Optical Dynamics in Perovskite NdNiO₃ Thin Films via Broadband Pump-Probe Ellipsometry.

  • Yael Gutiérrez1
  • Ranjan Kumar Patel2
  • Saúl Vázquez-Miranda3
  • Mateusz Rebarz3
  • Shirly Espinoza3
  • Yeonghoon Jin4
  • Mikhail A Kats4
  • Shriram Ramanathan2
4 affiliations
  1. 1Departamento de Física Aplicada, Universidad de Cantabria, Avenida de los Castros, s/n, 39005 Santander, Spain.
  2. 2Department of Electrical and Computer Engineering, Rutgers University, Piscataway, New Jersey 08854, United States.
  3. 3ELI Beamlines Facility, The Extreme Light Infrastructure ERIC, Za Radnicí 835, 25241 Dolní Břežany, Czech Republic.
  4. 4Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
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Abstract

The tunable physical properties of strongly correlated oxides make them interesting for emerging device applications in opto-electronics as well as serve as prototypical systems for condensed matter physics research. Here, we report room-temperature, broadband time-resolved spectroscopic ellipsometry (TRSE) measurements of ultrafast optical dynamics in perovskite nickelate NdNiO₃ (NNO) thin films following femtosecond photoexcitation at three pump wavelengths (266, 400, and 800 nm). By tracking the transient complex dielectric function with sub-picosecond temporal resolution, we disentangle electronic and lattice contributions to the photoinduced response. Within the first picosecond, photoexcitation drives a rapid change in the dielectric function of NNO, attributed to the generation of a nonequilibrium electron population, accompanied by a transient reduction in Drude spectral weight and enhanced carrier scattering consistent with a crossover toward a bad-metal state. Short-lived coherent optical phonon oscillations are observed in the photon energy domain during the first hundreds of fs. At longer time scales (10-100 ps), coherent acoustic strain generates Brillouin oscillations in the transient ellipsometry signal, consistent with time-domain Brillouin scattering from the propagating strain pulse generated at the NNO layer after its transmission into the substrate.

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Cite

BibTeXRIS
BibTeX
@article{gutierrez2026subpicosecond,
  title = {{Sub-Picosecond Optical Dynamics in Perovskite NdNiO₃ Thin Films via Broadband Pump-Probe Ellipsometry.}},
  author = {Yael Gutiérrez and Ranjan Kumar Patel and Saúl Vázquez-Miranda and Mateusz Rebarz and Shirly Espinoza and Yeonghoon Jin and Mikhail A Kats and Shriram Ramanathan},
  journal = {ACS photonics},
  year = {2026},
  month = oct,
  doi = {10.1021/acsphotonics.6c01634},
  url = {https://europepmc.org/article/MED/42921533},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Sub-Picosecond Optical Dynamics in Perovskite NdNiO₃ Thin Films via Broadband Pump-Probe Ellipsometry.
AU  - Yael Gutiérrez
AU  - Ranjan Kumar Patel
AU  - Saúl Vázquez-Miranda
AU  - Mateusz Rebarz
AU  - Shirly Espinoza
AU  - Yeonghoon Jin
AU  - Mikhail A Kats
AU  - Shriram Ramanathan
PY  - 2026
DA  - 2026/10/06
JO  - ACS photonics
DO  - 10.1021/acsphotonics.6c01634
UR  - https://europepmc.org/article/MED/42921533
AB  - The tunable physical properties of strongly correlated oxides make them interesting for emerging device applications in opto-electronics as well as serve as prototypical systems for condensed matter physics research. Here, we report room-temperature, broadband time-resolved spectroscopic ellipsometry (TRSE) measurements of ultrafast optical dynamics in perovskite nickelate NdNiO₃ (NNO) thin films following femtosecond photoexcitation at three pump wavelengths (266, 400, and 800 nm). By tracking the transient complex dielectric function with sub-picosecond temporal resolution, we disentangle electronic and lattice contributions to the photoinduced response. Within the first picosecond, photoexcitation drives a rapid change in the dielectric function of NNO, attributed to the generation of a nonequilibrium electron population, accompanied by a transient reduction in Drude spectral weight and enhanced carrier scattering consistent with a crossover toward a bad-metal state. Short-lived coherent optical phonon oscillations are observed in the photon energy domain during the first hundreds of fs. At longer time scales (10-100 ps), coherent acoustic strain generates Brillouin oscillations in the transient ellipsometry signal, consistent with time-domain Brillouin scattering from the propagating strain pulse generated at the NNO layer after its transmission into the substrate.
SN  - 2330-4022
ER  -