Symmetry forces Bloch wavefunctions to vanish at a pattern of real-space points (the 'dark set') that encodes the band's irreducible representation and, through known indicators, its topological index.
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Real-Space Imaging of Band Topology via Wavefunction Zeros
Symmetry forces Bloch wavefunctions to vanish at a pattern of real-space points (the 'dark set') that encodes the band's irreducible representation and, through known indicators, its topological index.