Classification of topological ladder models into six types (three BDI, three AIII) linked to Wilson fermion configurations, with bowtie ladder as canonical geometry from which others derive via unitary transformation.
That is, being the edge mode|e⟩ in Eq.(84) an eigenstate of the bowtie ladder Hamiltonian with some energy E, then the state US|e⟩ is another eigenstate with energy −E
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Classification of topological ladder models
Classification of topological ladder models into six types (three BDI, three AIII) linked to Wilson fermion configurations, with bowtie ladder as canonical geometry from which others derive via unitary transformation.