High-order exceptional points in non-Hermitian Moiré lattices

doi:10.1007/s11467-019-0899-y

Front. Phys.

2019, Vol. 14

Issue (5) : 53603 https://doi.org/10.1007/s11467-019-0899-y

RESEARCH ARTICLE

High-order exceptional points in non-Hermitian Moiré lattices

Yan-Rong Zhang¹, Ze-Zheng Zhang¹, Jia-Qi Yuan¹, Ming Kang²(

), Jing Chen^1,³(

)

¹. MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
². College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
³. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

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Abstract

This study proposes an approach to generate high-order exceptional points (EPs) in non-Hermitian systems. A system comprising a homogenous waveguide is considered wherein the imaginary part of the refractive index is modulated using a one-dimensional Moiré profile. This gain-loss modulation couples different lossless waveguide modes, and these hybrid modes can be modeled using a non-Hermitian matrix with complex off-diagonal elements. Results indicate that third-order EPs can be produced by the coalescence of two second-order EPs. Then, the necessary requirements are analyzed using coupled-wave equations and the physical effects of the singularities are discussed.

Keywords exceptional points non-Hermitian quantum physics quantum optics phase transitions

Corresponding Author(s): Ming Kang,Jing Chen

Issue Date: 13 May 2019

Cite this article:

Yan-Rong Zhang,Ze-Zheng Zhang,Jia-Qi Yuan, et al. High-order exceptional points in non-Hermitian Moiré lattices[J]. Front. Phys. , 2019, 14(5): 53603.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-019-0899-y
https://academic.hep.com.cn/fop/EN/Y2019/V14/I5/53603

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