2015/06/16 by Zhenhai Wang, Xiang-Feng Zhou, Xiaoming Zhang +4 · 2 citations
Physics and Astronomy · #cond-mat.mtrl-sci
paper · pdf · doi:10.1021/acs.nanolett.5b02512
5 pages, 3 figures
arxiv created 2015/06/16 · arxiv updated 2015/09/02
Using systematic evolutionary structure searching we propose a new carbon allotrope, phagraphene, standing for penta-hexa-hepta-graphene, because the structure is composed of 5-6-7 carbon rings. This two-dimensional (2D) carbon structure is lower in energy than most of the predicted 2D carbon allotropes due to its sp2-hybridization and density of atomic packing comparable to graphene. More interestingly, the electronic structure of phagraphene has distorted Dirac cones. The direction-dependent cones are further proved to be robust against external strain with tunable Fermi velocities.