Cargando…

Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (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...

Descripción completa

Detalles Bibliográficos
Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8578568/
https://www.ncbi.nlm.nih.gov/pubmed/34754019
http://dx.doi.org/10.1038/s41598-021-01333-z
_version_ 1784596259753951232
author 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
author_facet 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
author_sort Takane, Daichi
collection PubMed
description 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, XMg(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.
format Online
Article
Text
id pubmed-8578568
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-85785682021-11-10 Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr) 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 Sci Rep Article 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, XMg(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. Nature Publishing Group UK 2021-11-09 /pmc/articles/PMC8578568/ /pubmed/34754019 http://dx.doi.org/10.1038/s41598-021-01333-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
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
Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title_full Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title_fullStr Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title_full_unstemmed Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title_short Dirac semimetal phase and switching of band inversion in XMg(2)Bi(2) (X = Ba and Sr)
title_sort dirac semimetal phase and switching of band inversion in xmg(2)bi(2) (x = ba and sr)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8578568/
https://www.ncbi.nlm.nih.gov/pubmed/34754019
http://dx.doi.org/10.1038/s41598-021-01333-z
work_keys_str_mv AT takanedaichi diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT kubotayuya diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT nakayamakosuke diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT kawakamitappei diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT yamauchikunihiko diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT soumaseigo diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT katotakemi diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT sugawarakatsuaki diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT idetashinichiro diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT tanakakiyohisa diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT kitamuramiho diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT horibakoji diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT kumigashirahiroshi diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT oguchitamio diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT takahashitakashi diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT segawakouji diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr
AT satotakafumi diracsemimetalphaseandswitchingofbandinversioninxmg2bi2xbaandsr