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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 14. The spectra of a general non-Hermitian SSH chain with on-site potential energy under the OBC. In (a) and (b), α = 1.5, β = 1.5; in (c) and (d), α = −1.5, β = 1.5; in (e) and (f), α=1.5i,β=1.5i; in (g) and (h) α=1.5i,β=1.5i; in (i) and (j), α=3,β=3,α=3,β=3; in (k) and (l), α=3,β=3,α=3,β=3; in (m) and (n) α=4.5,β=0,α=4.5,β=0; in (o) and (p), α=0,β=5,α=0,β=5; in (q) and (r), α=3i,β=3i,α=3i,β=3i; in (s) and (t) α=3i,β=3i,α=3i,β=3i. The other parameters are Δ=2/3, t1 = 1, and N = 21. N is the number of lattice sites of one chain. The bands of the two non-Hermitian chains are marked with solid red and dashed green lines, respectively.