Hidden non-collinear spin-order induced topological surface states

Zengle Huang, Hemian Yi, Daniel Kaplan, Lujin Min, Hengxin Tan, Ying-Ting Chan, Zhiqiang Mao, Binghai Yan, Cui-Zu Chang and Weida Wu ()
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Zengle Huang: Rutgers University
Hemian Yi: The Pennsylvania State University
Daniel Kaplan: Rutgers University
Lujin Min: The Pennsylvania State University
Hengxin Tan: Weizmann Institute of Science
Ying-Ting Chan: Rutgers University
Zhiqiang Mao: The Pennsylvania State University
Binghai Yan: Weizmann Institute of Science
Cui-Zu Chang: The Pennsylvania State University
Weida Wu: Rutgers University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Rare-earth monopnictides are a family of materials simultaneously displaying complex magnetism, strong electronic correlation, and topological band structure. The recently discovered emergent arc-like surface states in these materials have been attributed to the multi-wave-vector antiferromagnetic order, yet the direct experimental evidence has been elusive. Here we report observation of non-collinear antiferromagnetic order with multiple modulations using spin-polarized scanning tunneling microscopy. Moreover, we discover a hidden spin-rotation transition of single-to-multiple modulations 2 K below the Néel temperature. The hidden transition coincides with the onset of the surface states splitting observed by our angle-resolved photoemission spectroscopy measurements. Single modulation gives rise to a band inversion with induced topological surface states in a local momentum region while the full Brillouin zone carries trivial topological indices, and multiple modulation further splits the surface bands via non-collinear spin tilting, as revealed by our calculations. The direct evidence of the non-collinear spin order in NdSb not only clarifies the mechanism of the emergent topological surface states, but also opens up a new paradigm of control and manipulation of band topology with magnetism.

Date: 2024
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DOI: 10.1038/s41467-024-47340-2

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