Step edges in 3D topological metals carry a robust non-integer conductance K e²/h determined by the bulk.
We do not consider such states here, since they depend on the topology of a sub- monolayer at the surface and not on topology of the bulk crystal
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Step-Edge Anomaly in Topological Metals
Step edges in 3D topological metals carry a robust non-integer conductance K e²/h determined by the bulk.