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arXiv · 2307.02878

Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb

Asuka Honma·Daichi Takane·Seigo Souma·Yongjian Wang·Kosuke Nakayama·Miho Kitamura·Koji Horiba·Hiroshi Kumigashira·Takashi Takahashi·Yoichi Ando·Takafumi Sato
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Abstract

We have performed micro-focused angle-resolved photoemission spectroscopy on NdSb which exhibits the type-I antiferromagnetism below TN = 16 K. We succeeded in selectively observing the band structure for all three types of single-q antiferromagnetic (AF) domains at the surface. We found that two of the three surfaces whose AF-ordering vector lies within the surface plane commonly show twofold symmetric surface states (SSs) around the bulk-band edges, whereas the other surface with an out-of-plane AF-ordering vector displays fourfold symmetric shallow electronlike SS at the Brillouin-zone center. We suggest that these SSs commonly originate from the combination of the PT (space-inversion and time-reversal) symmetry breaking at the surface and the band folding due to the AF order. The present results pave a pathway toward understanding the relationship between the symmetry and the surface electronic states in antiferromagnets.

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Asuka Honma, Daichi Takane, Seigo Souma, Yongjian Wang, Kosuke Nakayama, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yoichi Ando, Takafumi Sato. 2023-07-06. Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb. https://doi.org/10.1103/physrevb.108.115118

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