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Layered kagome compound Na2Ni3S4 with topological flat band |
| Junyao Ye(叶君耀)1, Yihao Lin(林益浩)1, Haozhe Wang(王浩哲)2, Zhida Song(宋志达)1, Ji Feng(冯济)1, Weiwei Xie(谢韦伟)2, and Shuang Jia(贾爽)1,3,4,† |
1 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
2 Department of Chemistry, Michigan State University, MI, 48824, USA;
3 Hefei National Laboratory, Hefei 230088, China;
4 Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China |
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Abstract 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.
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Received: 01 March 2024
Revised: 13 March 2024
Accepted manuscript online: 15 March 2024
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PACS:
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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72.15.Eb
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(Electrical and thermal conduction in crystalline metals and alloys)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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61.05.C-
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(X-ray diffraction and scattering)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12141002 and 12225401), the National Key Research and Development Program of China (Grant No. 2021YFA1401902), the CAS Interdisciplinary Innovation Team, and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000). |
Corresponding Authors:
Shuang Jia
E-mail: gwljiashuang@pku.edu.cn
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Cite this article:
Junyao Ye(叶君耀), Yihao Lin(林益浩), Haozhe Wang(王浩哲), Zhida Song(宋志达), Ji Feng(冯济), Weiwei Xie(谢韦伟), and Shuang Jia(贾爽) Layered kagome compound Na2Ni3S4 with topological flat band 2024 Chin. Phys. B 33 057103
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