Two-dimensional azulenoid-kekulene carbon allotropes AKC-[3,3] and AKC-[6,0] host a higher-order topological phase with quantized corner charge e/3 and protected corner states.
Topological switch between second-order topological insulators and topological crystalline insulators
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Second-order topology in two-dimensional azulenoid kekulene carbon lattices
Two-dimensional azulenoid-kekulene carbon allotropes AKC-[3,3] and AKC-[6,0] host a higher-order topological phase with quantized corner charge e/3 and protected corner states.