Corner states with e/2 charges appear on half the corners of a cleaved obstructed atomic insulator only when the dangling bonds at those corners are tilted, not aligned with the cut.
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Higher-Order Topological States with Cleavage-Dependent Dirac Mass
Corner states with e/2 charges appear on half the corners of a cleaved obstructed atomic insulator only when the dangling bonds at those corners are tilted, not aligned with the cut.