Fig. 2: Numerical results of two order parameters for characterizing size-controlled non-Hermitian topological synchronization.
From: Observation of non-Hermitian topological synchronization

a1, a2 The numerical result of the first order-parameter \({O}_{1}\) and the second order-parameter O2 as a function of the lattice length with \(u=-1\). The blue, green, and orange domains represent regions of non-Hermitian topological global frequency synchronization, separated boundary/bulk non-Hermitian topological synchronization, and non-Hermitian topological boundary synchronization. b1, b2, c1, c2. Numerical results of O1 and O2 as a function of the lattice length with u = −1.2 and u = −1.3.