Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class

We discuss first-principles topological electronic structure of noncentrosymmetric SrSi(2) materials class based on the hybrid exchange-correlation functional. Topological phase diagram of SrSi(2) is mapped out as a function of the lattice constant with focus on the semimetal order. A tunable double...

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Autores principales: Singh, Bahadur, Chang, Guoqing, Chang, Tay-Rong, Huang, Shin-Ming, Su, Chenliang, Lin, Ming-Chieh, Lin, Hsin, Bansil, Arun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6043586/
https://www.ncbi.nlm.nih.gov/pubmed/30002388
http://dx.doi.org/10.1038/s41598-018-28644-y
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author Singh, Bahadur
Chang, Guoqing
Chang, Tay-Rong
Huang, Shin-Ming
Su, Chenliang
Lin, Ming-Chieh
Lin, Hsin
Bansil, Arun
author_facet Singh, Bahadur
Chang, Guoqing
Chang, Tay-Rong
Huang, Shin-Ming
Su, Chenliang
Lin, Ming-Chieh
Lin, Hsin
Bansil, Arun
author_sort Singh, Bahadur
collection PubMed
description We discuss first-principles topological electronic structure of noncentrosymmetric SrSi(2) materials class based on the hybrid exchange-correlation functional. Topological phase diagram of SrSi(2) is mapped out as a function of the lattice constant with focus on the semimetal order. A tunable double-Weyl Fermion state in Sr(1−x)Ca(x)Si(2) and Sr(1−x)Ba(x)Si(2) alloys is identified. Ca doping in SrSi(2) is shown to yield a double-Weyl semimetal with a large Fermi arc length, while Ba doping leads to a transition from the topological semimetal to a gapped insulator state. Our study indicates that SrSi(2) materials family could provide an interesting platform for accessing the unique topological properties of Weyl semimetals.
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spelling pubmed-60435862018-07-15 Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class Singh, Bahadur Chang, Guoqing Chang, Tay-Rong Huang, Shin-Ming Su, Chenliang Lin, Ming-Chieh Lin, Hsin Bansil, Arun Sci Rep Article We discuss first-principles topological electronic structure of noncentrosymmetric SrSi(2) materials class based on the hybrid exchange-correlation functional. Topological phase diagram of SrSi(2) is mapped out as a function of the lattice constant with focus on the semimetal order. A tunable double-Weyl Fermion state in Sr(1−x)Ca(x)Si(2) and Sr(1−x)Ba(x)Si(2) alloys is identified. Ca doping in SrSi(2) is shown to yield a double-Weyl semimetal with a large Fermi arc length, while Ba doping leads to a transition from the topological semimetal to a gapped insulator state. Our study indicates that SrSi(2) materials family could provide an interesting platform for accessing the unique topological properties of Weyl semimetals. Nature Publishing Group UK 2018-07-12 /pmc/articles/PMC6043586/ /pubmed/30002388 http://dx.doi.org/10.1038/s41598-018-28644-y Text en © The Author(s) 2018 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Singh, Bahadur
Chang, Guoqing
Chang, Tay-Rong
Huang, Shin-Ming
Su, Chenliang
Lin, Ming-Chieh
Lin, Hsin
Bansil, Arun
Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title_full Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title_fullStr Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title_full_unstemmed Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title_short Tunable double-Weyl Fermion semimetal state in the SrSi(2) materials class
title_sort tunable double-weyl fermion semimetal state in the srsi(2) materials class
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6043586/
https://www.ncbi.nlm.nih.gov/pubmed/30002388
http://dx.doi.org/10.1038/s41598-018-28644-y
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