Critical points between obstructed atomic insulators in (2+1)D can realize stable QED3 when microscopic lattice symmetries suppress monopoles.
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Arsenic monolayers exhibit phase-dependent band structures and excitonic optical responses, with strain driving band inversions between puckered and planar forms.
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When Wannier centers jump: Critical points between atomic insulating phases
Critical points between obstructed atomic insulators in (2+1)D can realize stable QED3 when microscopic lattice symmetries suppress monopoles.
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Electronic and optical properties of arsenic monolayers: from planar honeycomb to the puckered phase
Arsenic monolayers exhibit phase-dependent band structures and excitonic optical responses, with strain driving band inversions between puckered and planar forms.