nLab Robert-Jan Slager

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Selected writings

Selected writings

On topological crystalline insulators:

On topological crystalline insulators and their classification by equivariant K-theory:

On anyonic braiding of nodal points in the Brillouin zone of semi-metals (“braiding in momentum space”):

Arguments that some effects in topological phases of matter are “unstable” or “fragile” in that the relevant deformation class of their valence bundles over the Brillouin torus is not their class in topological K-theory (as assumed by the K-theory classification of topological phases of matter) but an unstable homotopy class (what may be called a class in generalized nonabelian cohomology) such as of maps to a Grassmannian space (or more general flag variety) classifying (systems of) sub-bundles of a trivial vector bundle of fixed finite rank:

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