Observation of Dirac hierarchy in three-dimensional acoustic topological insulators

• Main Authors: Yang, Linyun, Wang, Yin, Meng, Yan, Zhu, Zhenxiao, Xi, Xiang, Yan, Bei, Lin, Shuxin, Chen, Jingming, Shi, Bin-Jie, Ge, Yong, Yuan, Shou-Qi, Chen, Hongsheng, Sun, Hong-Xiang, Liu, Gui-Geng, Yang, Yihao, Gao, Zhen
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics; Electric Insulators; Acoustic Measurements
• Online Access: https://hdl.handle.net/10356/170754
• Institution: Nanyang Technological University

Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless electrons in graphene to robust surface states in topological insulators (TIs). Recent studies have theoretically revealed a full Dirac hierarchy comprising an eightfold bulk DC, a fourfold surface DC, and a twof...