Topological phononic metamaterials

W Zhu, W Deng, Y Liu, J Lu, HX Wang… - Reports on Progress …, 2023‏ - iopscience.iop.org
The concept of topological energy bands and their manifestations have been demonstrated
in condensed matter systems as a fantastic paradigm toward unprecedented physical …

Non-Abelian physics in light and sound

Y Yang, B Yang, G Ma, J Li, S Zhang, CT Chan - Science, 2024‏ - science.org
Non-Abelian phenomena arise when the sequence of operations on physical systems
influences their behaviors. By possessing internal degrees of freedom such as polarization …

Real topological phonons in 3D carbon allotropes

X Wang, J Bai, J Wang, Z Cheng, S Qian… - Advanced …, 2024‏ - Wiley Online Library
There has been a significant focus on real topological systems that enjoy space‐time
inversion symmetry and lack spin‐orbit coupling. While the theoretical classification of the …

Non-Abelian frame charge flow in photonic media

D Wang, Y Wu, ZQ Zhang, CT Chan - Physical Review X, 2023‏ - APS
In PT-symmetric systems, the notion of non-Abelian frame charges enables multiband
topological characterization of degeneracies by examining the eigenvector-frame rotations …

Ubiquitous topological states of phonons in solids: Silicon as a model material

Y Liu, N Zou, S Zhao, X Chen, Y Xu, W Duan - Nano letters, 2022‏ - ACS Publications
Research on topological physics of phonons has attracted enormous interest but demands
appropriate model materials. Our ab initio calculations identify silicon as an ideal candidate …

Four-band non-Abelian topological insulator and its experimental realization

T Jiang, Q Guo, RY Zhang, ZQ Zhang, B Yang… - Nature …, 2021‏ - nature.com
Very recently, increasing attention has been focused on non-Abelian topological charges,
eg, the quaternion group Q8. Different from Abelian topological band insulators, these …

Symmetry-enforced topological band crossings in orthorhombic crystals: Classification and materials discovery

A Leonhardt, MM Hirschmann, N Heinsdorf, X Wu… - Physical Review …, 2021‏ - APS
We identify all symmetry-enforced band crossings in nonmagnetic orthorhombic crystals with
and without spin-orbit coupling and discuss their topological properties. We find that …

Observation of non-Abelian charged nodes linking nonadjacent gaps

D Wang, B Yang, M Wang, RY Zhang, X Li, ZQ Zhang… - Physical Review Letters, 2022‏ - APS
Nodal links are special configurations of band degeneracies in the momentum space, where
nodal line branches encircle each other. In PT symmetric systems, nodal lines can be …

Exact universal characterization of chiral-symmetric higher-order topological phases

JZ Li, XJ Luo, F Wu, M **ao - arxiv preprint arxiv:2404.19757, 2024‏ - arxiv.org
Utilizing a series of Bott indices formulated through polynomials of position operators, we
establish a comprehensive framework for characterizing topological zero-energy corner …

Bulk-edge correspondence of Stiefel-Whitney and Euler insulators through the entanglement spectrum and cutting procedure

R Takahashi, T Ozawa - Physical Review B, 2023‏ - APS
We propose an unconventional bulk-edge correspondence for two-dimensional Stiefel-
Whitney insulators and Euler insulators, which are topological insulators protected by the PT …