Optical investigation of the electronic structure of a ferromagnetic Weyl semimetal CeAlSi

Abstract

To investigate electronic states during the ferromagnetic transition in a magnetic Weyl semimetal CeAlSi, we measured temperature-dependent optical conductivity [σ₁(ω)] spectra and compared them with DFT+DMFT band calculations. The σ₁(ω) spectrum did not change significantly across the ferromagnetic ordering temperature (T_C), suggesting that the Ce 4f states are almost localized. DFT+DMFT calculations with almost localized Ce 4f states successfully reproduced the spectral shape and the unchanged σ₁(ω) spectra across T_C. The dynamic effective mass evaluated from the extended Drude model is very small, which DFT+DMFT calculations also reproduce, but the scattering probability at even lower temperatures suggests ferromagnetic fluctuations. These results suggest that the interaction intensity between the Weyl fermions and Ce 4f states is very weak, as reproduced by DFT+DMFT calculations.

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BibTeX RIS

BibTeX

@misc{kimura2026optical,
  title = {{Optical investigation of the electronic structure of a ferromagnetic Weyl semimetal CeAlSi}},
  author = {Shin-ichi Kimura and Yue Pan and Hiroshi Watanabe and Akimitsu Kirikoshi and Junya Otsuki and Hiroshi Tanida},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.18592},
  eprint = {2609.18592},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.18592},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Optical investigation of the electronic structure of a ferromagnetic Weyl semimetal CeAlSi
AU  - Shin-ichi Kimura
AU  - Yue Pan
AU  - Hiroshi Watanabe
AU  - Akimitsu Kirikoshi
AU  - Junya Otsuki
AU  - Hiroshi Tanida
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.18592
UR  - https://arxiv.org/abs/2609.18592
AB  - To investigate electronic states during the ferromagnetic transition in a magnetic Weyl semimetal CeAlSi, we measured temperature-dependent optical conductivity [σ_1(ω)] spectra and compared them with DFT+DMFT band calculations. The σ_1(ω) spectrum did not change significantly across the ferromagnetic ordering temperature (T_C), suggesting that the Ce 4f states are almost localized. DFT+DMFT calculations with almost localized Ce 4f states successfully reproduced the spectral shape and the unchanged σ_1(ω) spectra across T_C. The dynamic effective mass evaluated from the extended Drude model is very small, which DFT+DMFT calculations also reproduce, but the scattering probability at even lower temperatures suggests ferromagnetic fluctuations. These results suggest that the interaction intensity between the Weyl fermions and Ce 4f states is very weak, as reproduced by DFT+DMFT calculations.
ER  -

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