Disordered two-leg electron ladders are claimed to show topological order with e/2 semions and the same entanglement entropy as zigzag graphene nanoribbons, though the analytic DOS derivation is internally inconsistent.
Eric Yang,Topologically Ordered Zigzag Nanoribbon:e/2 Fractionally Charged Anyons and Spin-Charge Separation (World Scientific, 2023)
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Instantons and topological order in two-leg electron ladders: A universality class
Disordered two-leg electron ladders are claimed to show topological order with e/2 semions and the same entanglement entropy as zigzag graphene nanoribbons, though the analytic DOS derivation is internally inconsistent.