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.
(138), vanishes and, thus, the on-site energy can take any value
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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.