SSH Model — Topological Insulator Bulk-Edge Correspondence

The Su-Schrieffer-Heeger (SSH) chain alternates hopping amplitudes v (intracell) and w (intercell). When |w| > |v|, the winding number W=1 and topologically protected edge states appear at zero energy. Bulk-edge correspondence: bulk topology guarantees edge states.

v (intracell hop)0.4 w (intercell hop)1.0 Chain length N20 Disorder δ0.00

Topological (W=1): edge states present