Global symmetry found to be not completely necessary for the protection of topological boundary states

Schematic illustration classifying perturbations in the symmetry-protected topological phase (SPT phase). The overlapping region surrounded by red, gray, and green lines represents a symmetry-protected topological phase featuring topological invariant and corresponding topological boundary states. The gray line is a set of perturbations affecting the boundary states but not breaking the topological invariant of the overall system. Red and green line areas show boundary states protected by their respectively associated…

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News Source: phys.org


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