Three-dimensional Dirac semimetal metamaterial enabled by negative couplings
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影响因子：3.716
DOI码：10.1088/1367-2630/ac575a
发表刊物：New Journal of Physics
摘要：Three-dimensional (3D) semimetals with fourfold degenerate Dirac points are of prominent importance in topological photonics as the parent states to Weyl nodes, line nodes, & etc. The dispersions on all the momentums’ directions are linear, which represents that the Dirac point and topologically protected helicoid surface states may exist. Here, we have demonstrated an acoustic metamaterial with Dirac points by designing the sign of coupling terms, specifically incorporating negative couplings. Tuning the coupling parameter along longitudinal direction, the transition from 3D Dirac point to Weyl points can be obtained. In realistic topological metamaterial designing, the negative coupling is realized by inserting additional off-resonant sites. The simulated band dispersion clearly shows four-band crossing point. The helicoid surface states are also proved. Our study provides a new approach of constructing 3D topological phase and shows the transition between nodal ring and Dirac point. Our results can be the theoretical basement of topological protected devices.
合写作者：Yongtian Wang,Bingyi Liu,Wenlong Gao
第一作者：Zhaoxian Sun
论文类型：期刊论文
通讯作者：Lingling Huang
论文编号：000770429700001
学科门类：理学
文献类型：J
卷号：24
期号：3
页面范围：033025
字数：3500
ISSN号：ISSN 1367-2630
是否译文：否
发表时间：2022-03-01
收录刊物：SCI
发布期刊链接：https://iopscience.iop.org/article/10.1088/1367-2630/ac575a