# Optical $N$-insulators: topological obstructions in the atomistic susceptibility tensor

@inproceedings{Mechelen2021OpticalT, title={Optical \$N\$-insulators: topological obstructions in the atomistic susceptibility tensor}, author={Todd Van Mechelen and Robert-Jan Slager and Sathwik Bharadwaj and Zubin Jacob}, year={2021} }

A powerful result of topological band theory is that nontrivial phases manifest obstructions to constructing localized Wannier functions. In Chern insulators, it is impossible to construct Wannier functions that respect translational symmetry in both directions. Similarly, Wannier functions that respect time-reversal symmetry cannot be formed in quantum spin Hall insulators. This molecular orbital interpretation of topology has been enlightening and was recently extended to topological…

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