SSH Model — Topological Insulator & Edge States

The Su-Schrieffer-Heeger (SSH) chain: alternating hopping amplitudes v (intra-cell) and w (inter-cell). Topological phase: w>v → winding number=1, in-gap edge states appear at zero energy. Trivial: w<v → gap but no edge states.

v (intra-cell): 0.50 w (inter-cell): 1.50 N (unit cells): 15