Exact analytical edge states are derived for the extended SSH model, with bulk-boundary correspondence established via winding number and |z|=1 condition at gap closings.
Shen,Topological Insulators: Dirac Equation in Condensed Matter, Springer Press, New York 2012
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Exact analytical edge states in the extended Su-Schrieffer-Heeger model
Exact analytical edge states are derived for the extended SSH model, with bulk-boundary correspondence established via winding number and |z|=1 condition at gap closings.