Surface Reconstruction in Low-Temperature ARPES Spectra of Charge-Ordered EuAl$_4$
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2026
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| author | Liu, Hao Chen, Bo Zhang, Chen Wu, Qi-Yi Cui, Sheng-Tao Sun, Zhe Fu, Zhong-Tuo Zhou, Ying Luo, Yang Liu, Jun Duan, Yu-Xia Meng, Jian-Qiao |
| author_facet | Liu, Hao Chen, Bo Zhang, Chen Wu, Qi-Yi Cui, Sheng-Tao Sun, Zhe Fu, Zhong-Tuo Zhou, Ying Luo, Yang Liu, Jun Duan, Yu-Xia Meng, Jian-Qiao |
| contents | Charge ordering in EuAl$_4$ has been widely discussed in connection with band reconstruction, magnetism,and topological electronic states, yet the microscopic origin of the complex low-temperature ARPES spectra remains unresolved. Here we combine photon-energy-, temperature-, and cleavage-history-dependent ARPES with firstprinciples calculations to separate intrinsic bulk bands from surface-derived spectral weight. Spectra measured on high-temperature-cleaved surfaces, both at 160 K and after cooling to 10 K, are well described by the calculated three-dimensional bulk electronic structure, whereas low-temperature-cleaved surfaces exhibit additional electron-like bands, replica-like Fermi-surface contours, and nearly kz-independent surface-derived features that are absent from the bulk calculations. These extra features are progressively suppressed upon warming, whereas the bulk-derived bands remain largely unchanged across the charge-density-wave transition within the experimental resolution. The combined analysis of photon-energy dependence, temperature evolution, and cleavage history identifies the reconstructed low-temperature spectral weight as arising predominantly from a thermally fragile surface reconstruction rather than from intrinsic bulk CDW-induced band folding. These results resolve an important ambiguity in EuAl$_4$ and provide spectroscopic criteria for distinguishing surface reconstruction from bulk charge-order effects in BaAl$_4$-family correlated semimetals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2606_00453 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Surface Reconstruction in Low-Temperature ARPES Spectra of Charge-Ordered EuAl$_4$ Liu, Hao Chen, Bo Zhang, Chen Wu, Qi-Yi Cui, Sheng-Tao Sun, Zhe Fu, Zhong-Tuo Zhou, Ying Luo, Yang Liu, Jun Duan, Yu-Xia Meng, Jian-Qiao Strongly Correlated Electrons Charge ordering in EuAl$_4$ has been widely discussed in connection with band reconstruction, magnetism,and topological electronic states, yet the microscopic origin of the complex low-temperature ARPES spectra remains unresolved. Here we combine photon-energy-, temperature-, and cleavage-history-dependent ARPES with firstprinciples calculations to separate intrinsic bulk bands from surface-derived spectral weight. Spectra measured on high-temperature-cleaved surfaces, both at 160 K and after cooling to 10 K, are well described by the calculated three-dimensional bulk electronic structure, whereas low-temperature-cleaved surfaces exhibit additional electron-like bands, replica-like Fermi-surface contours, and nearly kz-independent surface-derived features that are absent from the bulk calculations. These extra features are progressively suppressed upon warming, whereas the bulk-derived bands remain largely unchanged across the charge-density-wave transition within the experimental resolution. The combined analysis of photon-energy dependence, temperature evolution, and cleavage history identifies the reconstructed low-temperature spectral weight as arising predominantly from a thermally fragile surface reconstruction rather than from intrinsic bulk CDW-induced band folding. These results resolve an important ambiguity in EuAl$_4$ and provide spectroscopic criteria for distinguishing surface reconstruction from bulk charge-order effects in BaAl$_4$-family correlated semimetals. |
| title | Surface Reconstruction in Low-Temperature ARPES Spectra of Charge-Ordered EuAl$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2606.00453 |