A discrete, gauge-fixing-free formula computes the Z2 second Stiefel-Whitney class from Bloch states on a mesh, verified on tight-binding models.
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A Discrete Formulation of Second Stiefel-Whitney Class for Band Theory
A discrete, gauge-fixing-free formula computes the Z2 second Stiefel-Whitney class from Bloch states on a mesh, verified on tight-binding models.