Pseudospins and topological effects of phonons in a Kekule lattice
Abstract
The search for exotic topological effects of phonons has attracted enormous interest for both fundamental science and practical applications. By studying phonons in a Kekul\'e lattice, we find a new type of pseudospins characterized by quantized Berry phases and pseudoangular momenta, which introduces various novel topological effects, including topologically protected pseudospin-polarized interface states and a phonon pseudospin Hall effect. We further demonstrate a pseudospin-contrasting optical selection rule and a pseudospin Zeeman effect, giving a complete generation-manipulation-detection paradigm of the phonon pseudospin. The pseudospin and topology-related physics revealed for phonons is general and applicable for electrons, photons and other particles.
Cite
@article{arxiv.1708.06482,
title = {Pseudospins and topological effects of phonons in a Kekule lattice},
author = {Yizhou Liu and Chao-Sheng Lian and Yang Li and Yong Xu and Wenhui Duan},
journal= {arXiv preprint arXiv:1708.06482},
year = {2017}
}
Comments
5 pages, 4 figures, accepted by PRL