Dirac points and the transition towards Weyl points in three-dimensional sonic crystals

A four-fold-degenerate three-dimensional (3D) Dirac point, represents a degenerate pair of Weyl points carrying opposite chiralities. Moreover, 3D Dirac crystals have shown many exotic features different from those of Weyl crystals. How these features evolve from 3D Dirac to Weyl crystals is importa...

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Detalles Bibliográficos
Autores principales: Xie, Boyang, Liu, Hui, Cheng, Hua, Liu, Zhengyou, Tian, Jianguo, Chen, Shuqi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7755923/
https://www.ncbi.nlm.nih.gov/pubmed/33353935
http://dx.doi.org/10.1038/s41377-020-00416-2
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author Xie, Boyang
Liu, Hui
Cheng, Hua
Liu, Zhengyou
Tian, Jianguo
Chen, Shuqi
author_facet Xie, Boyang
Liu, Hui
Cheng, Hua
Liu, Zhengyou
Tian, Jianguo
Chen, Shuqi
author_sort Xie, Boyang
collection PubMed
description A four-fold-degenerate three-dimensional (3D) Dirac point, represents a degenerate pair of Weyl points carrying opposite chiralities. Moreover, 3D Dirac crystals have shown many exotic features different from those of Weyl crystals. How these features evolve from 3D Dirac to Weyl crystals is important in research on 3D topological matter. Here, we realized a pair of 3D acoustic Dirac points from band inversion in a hexagonal sonic crystal and observed the surface states and helical interface states connecting the Dirac points. Furthermore, each Dirac point can transition into a pair of Weyl points with the introduction of chiral hopping. The exotic features of the surface states and interface states are inherited by the resulting Weyl crystal. Our work may serve as an ideal platform for exploring exotic physical phenomena in 3D topological semimetals.
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spelling pubmed-77559232021-01-04 Dirac points and the transition towards Weyl points in three-dimensional sonic crystals Xie, Boyang Liu, Hui Cheng, Hua Liu, Zhengyou Tian, Jianguo Chen, Shuqi Light Sci Appl Article A four-fold-degenerate three-dimensional (3D) Dirac point, represents a degenerate pair of Weyl points carrying opposite chiralities. Moreover, 3D Dirac crystals have shown many exotic features different from those of Weyl crystals. How these features evolve from 3D Dirac to Weyl crystals is important in research on 3D topological matter. Here, we realized a pair of 3D acoustic Dirac points from band inversion in a hexagonal sonic crystal and observed the surface states and helical interface states connecting the Dirac points. Furthermore, each Dirac point can transition into a pair of Weyl points with the introduction of chiral hopping. The exotic features of the surface states and interface states are inherited by the resulting Weyl crystal. Our work may serve as an ideal platform for exploring exotic physical phenomena in 3D topological semimetals. Nature Publishing Group UK 2020-12-22 /pmc/articles/PMC7755923/ /pubmed/33353935 http://dx.doi.org/10.1038/s41377-020-00416-2 Text en © The Author(s) 2020 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
Xie, Boyang
Liu, Hui
Cheng, Hua
Liu, Zhengyou
Tian, Jianguo
Chen, Shuqi
Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title_full Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title_fullStr Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title_full_unstemmed Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title_short Dirac points and the transition towards Weyl points in three-dimensional sonic crystals
title_sort dirac points and the transition towards weyl points in three-dimensional sonic crystals
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7755923/
https://www.ncbi.nlm.nih.gov/pubmed/33353935
http://dx.doi.org/10.1038/s41377-020-00416-2
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