Fig. 4: Analysis of the Kitaev chain with free boundaries.
From: Strain topological metamaterials and revealing hidden topology in higher-order coordinates
a The winding number of \({\tilde{D}}_{s,{{{{{{{\rm{bulk}}}}}}}}}\) predicts a non-trivial phase for P > 2 contrary to the winding of \({\tilde{D}}_{u,{{{{{{{\rm{bulk}}}}}}}}}\) which predicted a non-trivial phase for P < 2 (see Fig. 3d for comparison). b Spectrum of a finite chain (N = 200) with both boundaries free as a function of P. Localized edge states emerge in the band gap for P > 2. c Profiles of the localized states on the free edges on strain coordinates. The bending (b) and shear (s) strain coordinates follow the pattern dictated by particle-hole symmetry. d Profiles of the localized states on the free edges on displacement coordinates. Their profiles appear distorted.
