Stiefel-Whitney topological charges in a three-dimensional acoustic nodal-line crystal

• Main Authors: Xue, Haoran, Chen, Z. Y., Cheng, Zheyu, Dai, J. X., Long, Yang, Zhao, Y. X., Zhang, Baile
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Physics; Science::Physics::Acoustics; Crystal Structure; Momentum
• Online Access: https://hdl.handle.net/10356/170087
• Institution: Nanyang Technological University

Band topology of materials describes the extent Bloch wavefunctions are twisted in momentum space. Such descriptions rely on a set of topological invariants, generally referred to as topological charges, which form a characteristic class in the mathematical structure of fiber bundles associated with...