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.
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Abstract -
Huang, Zengle ; Yi, Hemian ; Min, Lujin ; Mao, Zhiqiang ; Chang, Cui-Zu ; Wu, Weida ( , Physical Review B)
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Yi, Hemian ; Huang, Zengle ; Shi, Wujun ; Min, Lujin ; Wu, Rui ; Polley, C. M. ; Zhang, Ruoxi ; Zhao, Yi-Fan ; Zhou, Ling-Jie ; Adell, J. ; et al ( , Physical Review Research)
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Yan, J. -Q. ; Zhang, Q. ; Heitmann, T. ; Huang, Zengle ; Chen, K. Y. ; Cheng, J. -G. ; Wu, Weida ; Vaknin, D. ; Sales, B. C. ; McQueeney, R. J. ( , Physical Review Materials)