High-order exceptional points in non-Hermitian Moiré lattices
| العنوان: | High-order exceptional points in non-Hermitian Moiré lattices |
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| المؤلفون: | Jia-Qi Yuan, Jing Chen, Ze-Zheng Zhang, Yan-Rong Zhang, Ming Kang |
| المصدر: | Frontiers of Physics. 14 |
| بيانات النشر: | Springer Science and Business Media LLC, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Coalescence (physics), Physics, Quantum optics, Waveguide (electromagnetism), Phase transition, Physics and Astronomy (miscellaneous), Mathematical analysis, Moiré pattern, 01 natural sciences, Hermitian matrix, 0103 physical sciences, Gravitational singularity, 010306 general physics, Refractive index |
| الوصف: | 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 Moire 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. |
| تدمد: | 2095-0470 2095-0462 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::07c24a1a303b42f23a1d26b01159388b https://doi.org/10.1007/s11467-019-0899-y |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........07c24a1a303b42f23a1d26b01159388b |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 20950470 20950462 |
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