首页|Layered kagome compound Na2Ni3S4 with topological flat band
Layered kagome compound Na2Ni3S4 with topological flat band
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We report structural and electronic properties of Na2Ni3S4,a quasi-two-dimensional compound composed of alter-nating layers of[Ni3S4]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 dxz-orbital with C3+T symmetry in the presence of crystal-field splitting.
kagome latticeflat band
叶君耀、林益浩、王浩哲、宋志达、冯济、谢韦伟、贾爽
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International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China
Department of Chemistry,Michigan State University,MI,48824,USA
Hefei National Laboratory,Hefei 230088,China
Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials,Peking University,Beijing 100871,China
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