Fractional Disclination Charge and Discrete Shift in the Hofstadter Butterfly.
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DOI: 10.1103/physrevlett.129.275301
Abstract: In the presence of crystalline symmetries, topological phases of matter acquire a host of invariants leading to nontrivial quantized responses. Here we study a particular invariant, the discrete shift 𝒮, for the square lattice Hofstadter… read more here.
Keywords: disclination; discrete shift; charge; hofstadter ... See more keywords