Abstract
Carbon materials have attracted much attention due to their excellent electronic structure and topological properties. By linking the zigzag carbon chains with carbon dimers, we propose a new stable three-dimensional (3D) carbon allotrope: T-C20 carbon. This carbon structure has four nodal lines in the Brillouin zone (BZ) protected by mirror symmetry. Moreover, T-C20 carbon exhibits strong anisotropic optical properties and strong absorption in the whole infrared, visible and ultraviolet regions, which is suitable for the broadband photodetector. Our research provides a new idea for the construction of novel 3D topological carbon allotropes.
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