Observation of an acoustic octupole topological insulator

• Main Authors: Xue, Haoran, Ge, Yong, Sun, Hong-Xiang, Wang, Qiang, Jia, Ding, Guan, Yi-Jun, Yuan, Shou-Qi, Chong, Yidong, Zhang, Baile
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2021
• Subjects: Science::Physics; Topological Insulators; Acoustics
• Online Access: https://hdl.handle.net/10356/153318
• Institution: Nanyang Technological University

Berry phase associated with energy bands in crystals can lead to quantised observables like quantised dipole polarizations in one-dimensional topological insulators. Recent theories have generalised the concept of quantised dipoles to multipoles, resulting in the discovery of multipole topological i...