Magnetism and charge density wave order in kagome FeGe
Magnetism and charge density wave order in kagome FeGe
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DOI：
10.1038/s41567-023-01985-w
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发表时间：
2022-10
期刊：
影响因子：
19.6
通讯作者：
Xiaokun Teng;J. Oh;Hengxin Tan;Lebing Chen;Jian-wei Huang;B. Gao;J. Yin;J. Chu;M. Hashimoto-M.-Hash
中科院分区：
文献类型：
--
作者：
Xiaokun Teng;J. Oh;Hengxin Tan;Lebing Chen;Jian-wei Huang;B. Gao;J. Yin;J. Chu;M. Hashimoto-M.-Hash
电子关联经常导致量子材料中涌现出有序，一个例子是kagome晶格材料，其中拓扑状态存在于电子之间的强关联中。这是由于与可果美晶格几何相关的电子能带结构的特征：电子波函数相消干涉引起的平带、拓扑狄拉克交叉和一对货车霍韦奇点。在kagome晶格材料中发现了各种相关的电子相，包括磁性、电荷密度波、向列性和超导性。最近，在磁性可果美FeGe中发现了电荷密度波，为理解可果美材料中电荷有序和磁性之间的相互作用提供了平台。在这里，我们观察到所有三个电子签名的戈薇晶格FeGe使用角分辨光电子能谱。费米能级附近的货车霍韦奇异性的存在是由潜在的磁交换分裂驱动的。此外，我们显示光谱证据的电荷密度波附近的费米能级的差距。我们的观察点磁相互作用驱动的带修改导致的电荷密度波的形成，并表明在这个适度相关的戈薇金属的新兴磁性和电荷秩序之间的交织连接。
Electron correlations often lead to emergent orders in quantum materials, and one example is the kagome lattice materials where topological states exist in the presence of strong correlations between electrons. This arises from the features of the electronic band structure that are associated with the kagome lattice geometry: flat bands induced by destructive interference of the electronic wavefunctions, topological Dirac crossings and a pair of van Hove singularities. Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. Here we observe all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. The presence of van Hove singularities near the Fermi level is driven by the underlying magnetic exchange splitting. Furthermore, we show spectral evidence for the charge density wave as gaps near the Fermi level. Our observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal.