PT-symmetric topological near-zero interface state
Abstract
Photonic systems with parity-time (PT) symmetry and topology are attracting considerable attentions. In this work, topological near-zero edge states are studied in PT-symmetric photonic lattice and the results indicate that the near-zero edge states can be broken spontaneously in spite of the unbroken PT symmetry. To achieve the stable topological near-zero mode, a binary lattice with carefully designed PT-symmetric is proposed. Further study shows such a structure supports a stable topological interface state experiences phase transition similar to the bulk states in infinite lattice and thus possess real-eigenvalues even with unbroken PT phase. Our study enriches the content of non-Hermitian topological physics and might have potential applications in the fields of topological lasing and quantum computation.
Cite
@article{arxiv.2009.03495,
title = {PT-symmetric topological near-zero interface state},
author = {Zhenjuan Liu and Kaiwen Ji and Haohao Wang and Yanan Dai and Yuanmei Gao and Yanlong Shen and Yishan Wang and Xinyuan Qi and Jintao Bai},
journal= {arXiv preprint arXiv:2009.03495},
year = {2020}
}