Four-fold non-Hermitian phase transitions and non-reciprocal coupled resonator optical waveguides

TL;DR

This paper presents a comprehensive phase diagram for non-Hermitian systems, revealing four distinct phase transitions involving topological and skin modes, supported by analytical and numerical methods, and demonstrates these effects in coupled resonator optical waveguides.

Contribution

It introduces a four-fold non-Hermitian phase diagram with analytical winding number calculations and applies it to coupled resonator optical waveguides, advancing understanding of non-Hermitian topological phases.

Findings

Four distinct non-Hermitian phases identified.

Analytical conditions for boundary modes derived.

Experimental design of optical waveguides demonstrating topological effects.

Abstract

Non-Hermitian systems can exhibit extraordinary sensitivity to boundary conditions. Given that topological boundary modes and non-Hermitian skin effects can either coexist or individually appear in non-Hermitian systems, it is of great value to present a comprehensive non-Hermitian phase diagram, for further flexible control in realistic non-Hermitian systems. Here, we reveal four-fold non-Hermitian phase transitions at a mathematically level, where phase I exhibits only topological boundary modes, phase II displays both topological boundary modes and skin modes, phase III exhibits only skin modes, and phase IV cannot manifest any boundary modes. By deriving non-Hermitian winding numbers, the existence or non-existence condition of topological boundary modes are analytically expressed, consistent with the numerical results obtained through the iterative Green's function method. Combining with the study on non-Hermitian skin effects, we rigorously establish the four-fold phase diagram. We also design an array of coupled resonator optical waveguides. The introduction of non-Hermiticity in the photonic structure induces a phenomenon similar to band inversion in topological insulators, indicating the presence of topological boundary modes in the photonic bands.