Under a parameter condition (Γ0 ≤ Γ2/3), multicritical points in a third-neighbor SSH/Kitaev chain retain one localized zero-energy edge mode per end, giving a topological invariant w_mc = 1.
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Topologically nontrivial multicritical points
Under a parameter condition (Γ0 ≤ Γ2/3), multicritical points in a third-neighbor SSH/Kitaev chain retain one localized zero-energy edge mode per end, giving a topological invariant w_mc = 1.