For attractive potentials ∝1/r^γ with γ>1 in graphene, atomic collapse occurs for arbitrarily small strength, and quasi-bound state energies obey |E_n|^((γ-1)/γ) ∝ n, with some states above the Dirac point.
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Atomic collapse of high-order singular potentials in graphene
For attractive potentials ∝1/r^γ with γ>1 in graphene, atomic collapse occurs for arbitrarily small strength, and quasi-bound state energies obey |E_n|^((γ-1)/γ) ∝ n, with some states above the Dirac point.