Special modes induced by inter-chain coupling in a non-Hermitian ladder system

Rong Huang,Yu Yan,Zhi-Xu Zhang,Lu Qi,Hong-Fu Wang,Shou Zhang

Figure 2. Spectra under the OBC and the density profiles of the special modes. (i), (j), (k), and (l) are the density profiles of the special modes corresponding to (a), (b), (c), and (d) at a fixed t = 0.5. In (a) and (e), γ = 0; in (b) and (f), γ = 0.2; in (c) and (g), γ = 0.45; in (d) and (h), γ = 3. The other parameters are Δ = 2/3, t1 = 1, and N = 21. N is the number of lattice sites in one chain. The special modes with $| E| =\gamma $ are marked with solid pink.