Fig. 3: Two types of chains without crossing the gap closing point.
From: Quantized polarization and Majorana fermions beyond tenfold classification
a Schematics of two types of configurations connecting \(A^{\prime}\) and B″ phases without crossing the gap closing point. The purple and orange lines indicate configurations with x1 < x2 and x1 > x2, respectively, where x1 and x2 are defined as the order-parameter-vanishing points satisfying Δ(x1) = 0 and mz(x2) = 0 for the energy-valued dimerization Δ and onsite energy mz. Energy eigenvalues for the chain configurations along the b purple (x1 = 123, x2 = 127), and c orange (x1 = 127, x2 = 123) lines. The parameters are the same as the AI domain-wall configuration of Fig. 2.
