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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.05958 |
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| _version_ | 1866915974668615680 |
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| author | Zhong, Jianqi Geng, Songyuan Ying, Teng-Fei Li, Haoxiang Zhou, Benjamin T. |
| author_facet | Zhong, Jianqi Geng, Songyuan Ying, Teng-Fei Li, Haoxiang Zhou, Benjamin T. |
| contents | The long-sought dice lattice flat band has recently been discovered for the first time in two-dimensional layered electride yttrium monochloride (YCl) [Nature Communications 17, 2213 (2026)]. While essential flat band features of YCl were captured by an idealized simple dice lattice model, we reveal in this Letter that a unique layer-orbital-valley coupling in YCl puts up a fundamental obstruction against a simple three-band dice lattice description of the flat band, and necessitates a multi-orbital description that faithfully represents the symmetry, topology, and correlation physics in the first-ever dice metal. Using an ab initio based multi-orbital Hubbard model with local interactions, we predict that the multi-orbital flat band supports a robust ferromagnetic ground state and electrically tunable correlated quantum anomalous Hall phases that are absent in an interacting single-orbital dice lattice. Our findings open a new avenue for exploring correlation and topology in electride systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_05958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | YCl Electride as a Multi-Orbital Correlated Topological Dice Lattice System Zhong, Jianqi Geng, Songyuan Ying, Teng-Fei Li, Haoxiang Zhou, Benjamin T. Materials Science Strongly Correlated Electrons The long-sought dice lattice flat band has recently been discovered for the first time in two-dimensional layered electride yttrium monochloride (YCl) [Nature Communications 17, 2213 (2026)]. While essential flat band features of YCl were captured by an idealized simple dice lattice model, we reveal in this Letter that a unique layer-orbital-valley coupling in YCl puts up a fundamental obstruction against a simple three-band dice lattice description of the flat band, and necessitates a multi-orbital description that faithfully represents the symmetry, topology, and correlation physics in the first-ever dice metal. Using an ab initio based multi-orbital Hubbard model with local interactions, we predict that the multi-orbital flat band supports a robust ferromagnetic ground state and electrically tunable correlated quantum anomalous Hall phases that are absent in an interacting single-orbital dice lattice. Our findings open a new avenue for exploring correlation and topology in electride systems. |
| title | YCl Electride as a Multi-Orbital Correlated Topological Dice Lattice System |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.05958 |