Visualization of Tunable Weyl Line in A–A Stacking Kagome Magnets
Visualization of Tunable Weyl Line in A–A Stacking Kagome Magnets
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AâA 堆叠 Kagome 磁铁中可调谐外尔线的可视化
DOI：
10.1002/adma.202205927
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发表时间：
2023
影响因子：
29.4
通讯作者：
Jozwiak, Chris
中科院分区：
文献类型：
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作者：
Cheng, Zi‐Jia;Belopolski, Ilya;Tien, Hung‐Ju;Cochran, Tyler A.;Yang, Xian P.;Ma, Wenlong;Yin, Jia‐Xin;Chen, Dong;Zhang, Junyi;Jozwiak, Chris
Kagome磁体为大量的拓扑量子现象提供了一个迷人的平台，其中受抑晶体结构，磁化和自旋轨道耦合（SOC）之间的微妙相互作用可以产生高度可调的拓扑状态。在这里，利用角分辨光电子能谱，在A-A堆叠的可果美磁体GdMn 6Sn 6中，外尔线被直接可视化，具有强的面外色散。值得注意的是，外尔线分别用Tb和Li取代Gd后表现出强的磁化方向可调的SOC带隙和结合能可调性。这些结果不仅说明了磁化方向和价数可以作为实现和控制不同3D拓扑相的有效调节旋钮，而且还证明了AMn 6Sn 6（A =稀土，或Li、Mg或Ca）是一种多功能材料家族，可用于探索不同的涌现拓扑量子响应。
Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena, in which the delicate interplay between frustrated crystal structure, magnetization, and spin–orbit coupling (SOC) can engender highly tunable topological states. Here, utilizing angle‐resolved photoemission spectroscopy, the Weyl lines are directly visualized with strong out‐of‐plane dispersion in the A–A stacked kagome magnet GdMn6Sn6. Remarkably, the Weyl lines exhibit a strong magnetization‐direction‐tunable SOC gap and binding energy tunability after substituting Gd with Tb and Li, respectively. These results not only illustrate the magnetization direction and valence counting as efficient tuning knobs for realizing and controlling distinct 3D topological phases, but also demonstrate AMn6Sn6(A = rare earth, or Li, Mg, or Ca) as a versatile material family for exploring diverse emergent topological quantum responses.