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

Abstract 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...

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Autores principales:	Daichi Takane, Yuya Kubota, Kosuke Nakayama, Tappei Kawakami, Kunihiko Yamauchi, Seigo Souma, Takemi Kato, Katsuaki Sugawara, Shin-ichiro Ideta, Kiyohisa Tanaka, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Tamio Oguchi, Takashi Takahashi, Kouji Segawa, Takafumi Sato
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/62fe5cd682e940e6b7053ea305fc94d9
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spelling	oai:doaj.org-article:62fe5cd682e940e6b7053ea305fc94d92021-11-14T12:21:36ZDirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)10.1038/s41598-021-01333-z2045-2322https://doaj.org/article/62fe5cd682e940e6b7053ea305fc94d92021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01333-zhttps://doaj.org/toc/2045-2322Abstract 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 BaMg2Bi2 is a TDS with a simple Dirac-band crossing around the Brillouin-zone center protected by the C3 symmetry of crystal. We also found that isostructural SrMg2Bi2 is an ordinary insulator characterized by the absence of band inversion due to the reduction of spin–orbit coupling. Thus, XMg2Bi2 (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.Daichi TakaneYuya KubotaKosuke NakayamaTappei KawakamiKunihiko YamauchiSeigo SoumaTakemi KatoKatsuaki SugawaraShin-ichiro IdetaKiyohisa TanakaMiho KitamuraKoji HoribaHiroshi KumigashiraTamio OguchiTakashi TakahashiKouji SegawaTakafumi SatoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Daichi Takane Yuya Kubota Kosuke Nakayama Tappei Kawakami Kunihiko Yamauchi Seigo Souma Takemi Kato Katsuaki Sugawara Shin-ichiro Ideta Kiyohisa Tanaka Miho Kitamura Koji Horiba Hiroshi Kumigashira Tamio Oguchi Takashi Takahashi Kouji Segawa Takafumi Sato Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
description	Abstract 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 BaMg2Bi2 is a TDS with a simple Dirac-band crossing around the Brillouin-zone center protected by the C3 symmetry of crystal. We also found that isostructural SrMg2Bi2 is an ordinary insulator characterized by the absence of band inversion due to the reduction of spin–orbit coupling. Thus, XMg2Bi2 (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.
format	article
author	Daichi Takane Yuya Kubota Kosuke Nakayama Tappei Kawakami Kunihiko Yamauchi Seigo Souma Takemi Kato Katsuaki Sugawara Shin-ichiro Ideta Kiyohisa Tanaka Miho Kitamura Koji Horiba Hiroshi Kumigashira Tamio Oguchi Takashi Takahashi Kouji Segawa Takafumi Sato
author_facet	Daichi Takane Yuya Kubota Kosuke Nakayama Tappei Kawakami Kunihiko Yamauchi Seigo Souma Takemi Kato Katsuaki Sugawara Shin-ichiro Ideta Kiyohisa Tanaka Miho Kitamura Koji Horiba Hiroshi Kumigashira Tamio Oguchi Takashi Takahashi Kouji Segawa Takafumi Sato
author_sort	Daichi Takane
title	Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
title_short	Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
title_full	Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
title_fullStr	Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
title_full_unstemmed	Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)
title_sort	dirac semimetal phase and switching of band inversion in xmg2bi2 (x = ba and sr)
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/62fe5cd682e940e6b7053ea305fc94d9
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Dirac semimetal phase and switching of band inversion in XMg2Bi2 (X = Ba and Sr)

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