The Su-Schrieffer-Heeger (SSH) model has two hopping amplitudes v (intracell) and w (intercell). When |w| > |v|, the chain is in a topologically non-trivial phase (winding number Z=1) and hosts zero-energy edge states localized at the boundaries.
v (intracell)
0.50
w (intercell)
1.00
N cells
12
Top: energy spectrum (sorted eigenvalues) — red dots mark zero-energy edge states when |w|>|v| | Bottom: spatial probability |ψ|² of selected state (click spectrum)