Z-ACA allotrope: a topological carbon material with obstructed Wannier charge center, real topology, and hinge states

Z-ACA allotrope: a topological carbon material with obstructed Wannier charge center, real topology, and hinge states

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As the most prevalent read more element on our planet, carbon manifests a wide variety of allotropic phases, significantly contributing to its complex physical properties.Recently, several carbon allotropes have been reported to possess abundant topological phases in theory and experiment.This work focuses on a sp3 carbon allotrope, Z-ACA allotrope, which consists of 5-6-7-type Z-ACA carbon rings.This allotrope has been reported previously as a Neuw Rebel Skinny Eternal Black Jeans superhard material comparable to diamond.

In this study, we report that it is a candidate for both an obstructed atomic insulator and a real Chern insulator.It is worth mentioning that Z-ACA exhibits an unconventional bulk-boundary correspondence due to its hinge boundary state manifestation.Our current research indicates that Z-ACA is a suitable carbon phase platform for studying the real topology and second-order bulk-boundary correspondence.