Non-Hermitian route to higher-order topology in an acoustic crystal

• Main Authors: Gao, He, Xue, Haoran, Gu, Zhongming, Liu, Tuo, Zhu, Jie, Zhang, Baile
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2022
• Subjects: Science::Physics; Topological Insulators; Non-Hermitian Physics
• Online Access: https://hdl.handle.net/10356/154809
• Institution: Nanyang Technological University

Topological phases of matter are classified based on their Hermitian Hamiltonians, whose real-valued dispersions together with orthogonal eigenstates form nontrivial topology. In the recently discovered higher-order topological insulators (TIs), the bulk topology can even exhibit hierarchical featur...