文献类型：期刊文献

英文题名：C4N3H monolayer: A novel two-dimensional organic Dirac material with high Fermi velocity

作者：Pan, Hongzhe[1,2]; Zhang, Hongyu[3]; Sun, Yuanyuan[1,2]; Li, Jianfu[2]; Du, Youwei[1]; Tang, Nujiang[1]

机构：[1] National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing, 210093, China; [2] School of Physics and Electronic Engineering, Linyi University, Linyi, 276005, China; [3] Department of Physics, East China University of Science and Technology, Shanghai, 200237, China

年份：2017

外文期刊名：arXiv

收录：EI(收录号：20200304651)

语种：英文

外文关键词：Graphene - Velocity

摘要：Searching for two-dimensional (2D) organic Dirac materials, which have more adaptable practical applications in comparing with inorganic ones, is of great significance and has been ongoing. However, only two kinds of these materials with low Fermi velocity have been discovered so far. Herein, we report the design of an organic monolayer with C4N3H stoichiometry which possesses fascinating structure and good stability in its free-standing state. More importantly, we demonstrate that this monolayer is a semimetal with anisotropic Dirac cones and very high Fermi velocity. This Fermi velocity is roughly one order of magnitude larger than that in 2D organic Dirac materials ever reported, and is comparable to that in graphene. The Dirac states in this monolayer arise from the extended π-electron conjugation system formed by the overlapping 2pz orbitals of carbon and nitrogen atoms. Our finding opens a door for searching more 2D organic Dirac materials with high Fermi velocity. Copyright ? 2017, The Authors. All rights reserved.