Layered Kagome Compound Na$_2$Ni$_3$S$_4$ with Topological Flat Band
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916211347947520 |
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| author | Ye, Junyao Lin, Yihao Wang, Haozhe Song, Zida Feng, Ji Xie, Weiwei Jia, Shuang |
| author_facet | Ye, Junyao Lin, Yihao Wang, Haozhe Song, Zida Feng, Ji Xie, Weiwei Jia, Shuang |
| contents | We report structural and electronic properties of Na$_2$Ni$_3$S$_4$, a quasi-two-dimensional compound composed of alternating layers of [Ni$_3$S$_4$]$^{2-}$ and Na$^{+}$. The compound features a remarkable Ni-based kagome lattice with a square planar configuration of four surrounding S atoms for each Ni atom. Magnetization and electrical measurements reveal a weak paramagnetic insulator with a gap of about 0.5 eV. Our band structure calculation highlights a set of topological flat bands of the kagome lattice derived from the rotated d$_{xz}$-orbital with $C_\mathrm{3}$ + $T$ symmetry in the presence of crystal-field splitting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_08456 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Layered Kagome Compound Na$_2$Ni$_3$S$_4$ with Topological Flat Band Ye, Junyao Lin, Yihao Wang, Haozhe Song, Zida Feng, Ji Xie, Weiwei Jia, Shuang Strongly Correlated Electrons We report structural and electronic properties of Na$_2$Ni$_3$S$_4$, a quasi-two-dimensional compound composed of alternating layers of [Ni$_3$S$_4$]$^{2-}$ and Na$^{+}$. The compound features a remarkable Ni-based kagome lattice with a square planar configuration of four surrounding S atoms for each Ni atom. Magnetization and electrical measurements reveal a weak paramagnetic insulator with a gap of about 0.5 eV. Our band structure calculation highlights a set of topological flat bands of the kagome lattice derived from the rotated d$_{xz}$-orbital with $C_\mathrm{3}$ + $T$ symmetry in the presence of crystal-field splitting. |
| title | Layered Kagome Compound Na$_2$Ni$_3$S$_4$ with Topological Flat Band |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.08456 |