准粒子
Weyl半金属
物理
磁性
凝聚态物理
费米子
望远镜
费米面
量子振荡
自旋(空气动力学)
半金属
量子力学
超导电性
带隙
热力学
作者
Jonathan Gaudet,Hung‐Yu Yang,Santu Baidya,Baozhu Lu,Guangyong Xu,Yang Zhao,J. A. Rodríguez-Rivera,Christina Hoffmann,David Graf,Darius Torchinsky,Predrag Nikolić,David Vanderbilt,Fazel Tafti,C. Broholm
出处
期刊:Nature Materials
[Springer Nature]
日期:2021-08-19
卷期号:20 (12): 1650-1656
被引量:47
标识
DOI:10.1038/s41563-021-01062-8
摘要
Emergent relativistic quasiparticles in Weyl semimetals are the source of exotic electronic properties such as surface Fermi arcs, the anomalous Hall effect and negative magnetoresistance, all observed in real materials. Whereas these phenomena highlight the effect of Weyl fermions on the electronic transport properties, less is known about what collective phenomena they may support. Here, we report a Weyl semimetal, NdAlSi, that offers an example. Using neutron diffraction, we found a long-wavelength helical magnetic order in NdAlSi, the periodicity of which is linked to the nesting vector between two topologically non-trivial Fermi pockets, which we characterize using density functional theory and quantum oscillation measurements. We further show the chiral transverse component of the spin structure is promoted by bond-oriented Dzyaloshinskii-Moriya interactions associated with Weyl exchange processes. Our work provides a rare example of Weyl fermions driving collective magnetism.
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