发表机构
Graduate School of Frontier Biosciences, The University of Osaka; Department of Physics, Graduate School of Science, The University of Osaka; Institute for Molecular Science; Institute for Chemical Research, Kyoto University; Research Institute for Interdisciplinary Science, Okayama University; Liberal Arts and Sciences, Toyama Prefectural University（大阪大学前沿生命科学研究生院; 大阪大学理学部物理学科; 分子科学研究所; 京都大学化学研究所以; 冈山大学理工学综合研究科; 富山县立大学教养学部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过光学电导率测量与DFT+DMFT计算，发现CeAlSi中Weyl费米子与Ce 4f态相互作用极弱，铁磁转变对电子结构影响甚微。
AI 中文摘要
为了研究磁性Weyl半金属CeAlSi在铁磁转变过程中的电子态，我们测量了随温度变化的光学电导率[σ₁(ω)]谱，并将其与DFT+DMFT能带计算结果进行了比较。σ₁(ω)谱在铁磁有序温度（T_C）附近没有显著变化，表明Ce 4f态几乎是局域的。采用几乎局域的Ce 4f态的DFT+DMFT计算成功再现了光谱形状以及跨T_C不变的σ₁(ω)谱。由扩展Drude模型评估的动态有效质量非常小，DFT+DMFT计算也再现了这一结果，但在更低温度下的散射概率暗示了铁磁涨落的存在。这些结果表明Weyl费米子与Ce 4f态之间的相互作用强度非常弱，正如DFT+DMFT计算所再现的那样。
英文摘要
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.
Comments6 pages, 4 figures, SM: 5 pages, 4 figures, 2 tables
