Square-root non-Bloch topological insulators in non-Hermitian ring resonators

• Published in: Optics express Vol. 29; no. 6; p. 8462
• Main Authors: Lin, Zekun, Ke, Shaolin, Zhu, Xuefeng, Li, Xun
• Format: Journal Article
• Language: English
• Published: United States 15.03.2021

We investigate the topological skin effect in a ring resonator array which can be mapped into the square root of a Su-Schrieffer-Heeger (SSH) model with non-Hermitian asymmetric coupling. The asymmetric coupling is realized by integrating the same amount of gain and loss into the two half perimeters...