Magnetic breakdown and spin-zero effect in quantum oscillations in kagome metal CsV3Sb5
Magnetic breakdown and spin-zero effect in quantum oscillations in kagome metal CsV3Sb5
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Kagome 金属 CsV3Sb5 量子振荡中的磁击穿和自旋零效应
DOI：
10.1038/s43246-023-00422-y
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发表时间：
2023
影响因子：
7.8
通讯作者：
Xiang, Ziji
中科院分区：
文献类型：
--
作者：
Chen, Kuan-Wen;Zheng, Guoxin;Zhang, Dechen;Chan, Aaron;Zhu, Yuan;Jenkins, Kaila;Yu, Fanghang;Shi, Mengzhu;Ying, Jianjun;Xiang, Ziji
在最近发现的Kagome金属CsV3Sb5中，一个有趣的提议调用了掺杂的陈氏绝缘体状态，表明存在包含自发轨道电流和大轨道磁矩的小陈费米口袋。虽然净热力学磁化强度对这些磁矩几乎不敏感，但由于它们的反铁磁性排列，它们的存在可以用塞曼效应来揭示，塞曼效应以有效的−因子给出的比例移动磁场中的电子能量。在这里，我们利用磁量子振荡中的自旋零效应来确定g因子。只有在包含大轨道矩的常规和集中Berry曲率费米口袋之间的磁击穿轨道上，才能看到大因子的增强。这种由Berry曲率产生的大轨道矩几乎总是被其他效应所掩盖。然而，在这个系统中，由于靠近常规的费米面截面，磁击穿轨道允许它们在磁量子振荡中明显地表现出来。我们的结果为量子材料中电子关联和更传统的电子能带之间的相互作用提供了一个显着的例子。
In the recently discovered kagome metal CsV3Sb5, an intriguing proposal invoking a doped Chern insulator state suggests the presence of small Chern Fermi pockets hosting spontaneous orbital-currents and large orbital magnetic moments. While the net thermodynamic magnetization is nearly insensitive to these moments, due to their antiferromagnetic alignment, their presence can be revealed by the Zeeman effect, which shifts electron energies in magnetic fields with a proportionality given by the effectiveg−factor. Here, we determine theg-factor using the spin-zero effect in magnetic quantum oscillations. A largeg-factor enhancement is visible only in magnetic breakdown orbits between conventional and concentrated Berry curvature Fermi pockets that host large orbital moments. Such Berry-curvature-generated large orbital moments are almost always concealed by other effects. In this system, however, magnetic breakdown orbits due to the proximity to a conventional Fermi-surface section allow them to be visibly manifested in magnetic quantum oscillations. Our results provide a remarkable example of the interplay between electronic correlations and more conventional electronic bands in quantum materials.