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Topological characterization of multifold band degeneracies in Altland-Zirnbauer symmetry classes
Topological band degeneracies are conventionally characterized by invariants defined on enclosing spheres over which the energy spectrum remains gapped. This program has been completed for minimal degeneracies in all ten Altland Zirnbauer (AZ) symmetry classes, whereas higher order degeneracies have been studied almost exclusively under crystalline symmetry protection. In this work, we characterize generic n fold ...