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 8. Spectra under the OBC and the density profiles of the zero-energy modes. (g), (h), and (i) are the density profiles of the special modes corresponding to (a), (b), and (c) at a fixed t = 3. In (a) and (d), γ = 0.2; in (b) and (e), γ = 2; in (c) and (f), γ = 5. The other parameters are Δ = 2/3, t1 = 1, and N = 21. N is the number of lattice sites of one chain. The zero-energy modes are marked with solid purple.