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PreprintCC BY 4.0arXiv

Unconventional charge density wave order in ErTe3: symmetry breakings and fluctuations probed by Raman scattering

  • Théotime Freitas
  • Mattia Udina
  • Alexandr Alekhin
  • Niloufar Nilforoushan
  • Sarah Houver
  • Alain Sacuto
  • Benito A. Gonzalez
  • Ian R. Fisher
  • Indranil Paul
  • Yann Gallais
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Abstract

Recent experiments have revealed unexpected mirror-symmetry breakings in the charge density-wave (CDW) state of rare-earth tritellurides, suggesting a putative ferro-axial CDW state. Here we report polarization-resolved Raman scattering measurements tracking the point-group symmetry breakings across the CDW phase transition in the rare-earth tritelluride ErTe3. We show that the mirror-symmetry breakings follow closely the emergence of the CDW order, suggesting a single component CDW order parameter. Furthermore, Raman measurements in the A2g symmetry channel above the CDW transition temperature indicate the absence of significant ferro-axial fluctuations. We discuss the broad implications of these findings with respect to the nature of the CDW state in the tritellurides.

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Cite

BibTeXRIS
BibTeX
@misc{freitas2026unconventional,
  title = {{Unconventional charge density wave order in ErTe$_3$: symmetry breakings and fluctuations probed by Raman scattering}},
  author = {Théotime Freitas and Mattia Udina and Alexandr Alekhin and Niloufar Nilforoushan and Sarah Houver and Alain Sacuto and Benito A. Gonzalez and Ian R. Fisher and Indranil Paul and Yann Gallais},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.32797},
  eprint = {2610.32797},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.32797},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Unconventional charge density wave order in ErTe_3: symmetry breakings and fluctuations probed by Raman scattering
AU  - Théotime Freitas
AU  - Mattia Udina
AU  - Alexandr Alekhin
AU  - Niloufar Nilforoushan
AU  - Sarah Houver
AU  - Alain Sacuto
AU  - Benito A. Gonzalez
AU  - Ian R. Fisher
AU  - Indranil Paul
AU  - Yann Gallais
PY  - 2026
DA  - 2026/10/23
PB  - arXiv
DO  - 10.48550/arxiv.2610.32797
UR  - https://arxiv.org/abs/2610.32797
AB  - Recent experiments have revealed unexpected mirror-symmetry breakings in the charge density-wave (CDW) state of rare-earth tritellurides, suggesting a putative ferro-axial CDW state. Here we report polarization-resolved Raman scattering measurements tracking the point-group symmetry breakings across the CDW phase transition in the rare-earth tritelluride ErTe_3. We show that the mirror-symmetry breakings follow closely the emergence of the CDW order, suggesting a single component CDW order parameter. Furthermore, Raman measurements in the A_2g symmetry channel above the CDW transition temperature indicate the absence of significant ferro-axial fluctuations. We discuss the broad implications of these findings with respect to the nature of the CDW state in the tritellurides.
ER  -