Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2

We have performed angle-resolved photoemission spectroscopy on EuIn2As2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacuum-ultraviolet photons, we revealed a three-dimensional hole pocket centered at the Gamma point of bulk Brillouin zone t...

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Published in:arXiv.org 2020-09
Main Authors: Sato, Takafumi, Wang, Zhiwei, Takane, Daichi, Souma, Seigo, Cui, Chaoxi, Li, Yongkai, Nakayama, Kosuke, Kawakami, Tappei, Kubota, Yuya, Cacho, Cephise, Kim, Timur K, Arab, Arian, Strocov, Vladimir N, Yao, Yugui, Takahashi, Takashi
Format: Article
Language:English
Subjects:
Antiferromagnetism
Band structure of solids
Brillouin zones
Electrons
First principles
Photoelectric emission
Qualitative analysis
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Summary:We have performed angle-resolved photoemission spectroscopy on EuIn2As2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacuum-ultraviolet photons, we revealed a three-dimensional hole pocket centered at the Gamma point of bulk Brillouin zone together with a heavily hole-doped surface state in the paramagnetic phase. Upon entering the antiferromagnetic phase, the band structure exhibits a marked reconstruction characterized by the emergence of a "M"-shaped bulk band near the Fermi level. The qualitative agreement with first-principles band-structure calculations suggests the occurrence of bulk-band inversion at the Gamma point in the antiferromagnetic phase. We suggest that EuIn2As2 provides a good opportunity to study the exotic quantum phases associated with possible axion-insulator phase.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.00873