Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)

Topological Dirac semimetals (TDSs) offer an excellent opportunity to realize outstanding physical properties distinct from those of topological insulators. Since TDSs verified so far have their own problems such as high reactivity in the atmosphere and difficulty in controlling topological phases v...

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Published in:Scientific reports 2021-11, Vol.11 (1), p.21937-21937, Article 21937
Main Authors: Takane, Daichi, Kubota, Yuya, Nakayama, Kosuke, Kawakami, Tappei, Yamauchi, Kunihiko, Souma, Seigo, Kato, Takemi, Sugawara, Katsuaki, Ideta, Shin-ichiro, Tanaka, Kiyohisa, Kitamura, Miho, Horiba, Koji, Kumigashira, Hiroshi, Oguchi, Tamio, Takahashi, Takashi, Segawa, Kouji, Sato, Takafumi
Format: Article
Language:English
Subjects:
639/301/119/2792/4128
639/301/119/995
Humanities and Social Sciences
multidisciplinary
Phase transitions
Physical properties
Science
Science (multidisciplinary)
Spectroscopy
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Summary:Topological Dirac semimetals (TDSs) offer an excellent opportunity to realize outstanding physical properties distinct from those of topological insulators. Since TDSs verified so far have their own problems such as high reactivity in the atmosphere and difficulty in controlling topological phases via chemical substitution, it is highly desirable to find a new material platform of TDSs. By angle-resolved photoemission spectroscopy combined with first-principles band-structure calculations, we show that ternary compound BaMg 2 Bi 2 is a TDS with a simple Dirac-band crossing around the Brillouin-zone center protected by the C 3 symmetry of crystal. We also found that isostructural SrMg 2 Bi 2 is an ordinary insulator characterized by the absence of band inversion due to the reduction of spin–orbit coupling. Thus, X Mg 2 Bi 2 ( X  = Sr, Ba, etc.) serves as a useful platform to study the interplay among crystal symmetry, spin–orbit coupling, and topological phase transition around the TDS phase.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-01333-z