Energy-Resolved Real-Space Imaging of Orbital Nematicity in an Fe-Based Superconductor
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866910010833895424 |
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| author | Onishi, Asato Xu, Zifan Bareille, Cédric Kageyama, Yoichi Ishida, Shigeyuki Eisaki, Hiroshi Ishihara, Kota Hashimoto, Kenichiro Taniuchi, Toshiyuki Shibauchi, Takasada |
| author_facet | Onishi, Asato Xu, Zifan Bareille, Cédric Kageyama, Yoichi Ishida, Shigeyuki Eisaki, Hiroshi Ishihara, Kota Hashimoto, Kenichiro Taniuchi, Toshiyuki Shibauchi, Takasada |
| contents | Electronic nematicity in Fe-based superconductors is manifested by spontaneous rotational symmetry breaking and the formation of nematic domains with mutually orthogonal directions of $d_{xz}$/$d_{yz}$ orbital anisotropy. However, its energy dependence has remained largely unexplored in real space. Using 5.82-eV laser-excited photoemission electron microscopy (laser-PEEM) with an energy-selective slit, we visualize the evolution of linear dichroic (LD) contrast within individual nematic domains of Ba$_{1-x}$Na$_x$Fe$_2$As$_2$ ($x\approx0.08$). We discover a sign reversal of the LD contrast at an energy $\sim0.4$ eV below the Fermi level, directly revealing an inversion of orbital anisotropy inside each domain. This behavior reflects a different energy-dependent redistribution of spectral weight between the $d_{xz}$ and $d_{yz}$ states, highlighting the crucial role of orbital-selective coherence in the nematic phase of Fe-based superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_02707 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Energy-Resolved Real-Space Imaging of Orbital Nematicity in an Fe-Based Superconductor Onishi, Asato Xu, Zifan Bareille, Cédric Kageyama, Yoichi Ishida, Shigeyuki Eisaki, Hiroshi Ishihara, Kota Hashimoto, Kenichiro Taniuchi, Toshiyuki Shibauchi, Takasada Superconductivity Strongly Correlated Electrons Electronic nematicity in Fe-based superconductors is manifested by spontaneous rotational symmetry breaking and the formation of nematic domains with mutually orthogonal directions of $d_{xz}$/$d_{yz}$ orbital anisotropy. However, its energy dependence has remained largely unexplored in real space. Using 5.82-eV laser-excited photoemission electron microscopy (laser-PEEM) with an energy-selective slit, we visualize the evolution of linear dichroic (LD) contrast within individual nematic domains of Ba$_{1-x}$Na$_x$Fe$_2$As$_2$ ($x\approx0.08$). We discover a sign reversal of the LD contrast at an energy $\sim0.4$ eV below the Fermi level, directly revealing an inversion of orbital anisotropy inside each domain. This behavior reflects a different energy-dependent redistribution of spectral weight between the $d_{xz}$ and $d_{yz}$ states, highlighting the crucial role of orbital-selective coherence in the nematic phase of Fe-based superconductors. |
| title | Energy-Resolved Real-Space Imaging of Orbital Nematicity in an Fe-Based Superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.02707 |