文献类型：期刊文献

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

作者：Pan, Hongzhe[1,2,3];Zhang, Hongyu[4];Sun, Yuanyuan[1,2,3];Li, Jianfu[3];Du, Youwei[1,2];Tang, Nujiang[1,2]

机构：[1]Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China;[2]Nanjing Univ, Jiangsu Prov Key Lab Nanotechnol, Nanjing 210093, Jiangsu, Peoples R China;[3]Linyi Univ, Sch Phys & Elect Engn, Linyi 276005, Peoples R China;[4]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2017

卷号：96

期号：19

外文期刊名：PHYSICAL REVIEW B

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000414527500010)】；

基金：We thank F. Liu of the University of Utah for helpful discussion. This work was financially supported by the State Key Program for Basic Research of China (Grants No. 2014CB921102 and No. 2017YFA0206304), the National Natural Science Foundation of China (Grants No. 51572122, No. 11304096, and No. 11674144), and the Natural Science Foundation of Shandong Province (Grant No. ZR2017JL007). We are grateful to the High Performance Computing Center of Nanjing University for doing the numerical calculations in this paper on its blade cluster system.

语种：英文

摘要：Searching for two-dimensional (2D) organic Dirac materials, which have more adaptable practical applications compared with inorganic ones, is of great significance and has been ongoing. However, only two such materials with low Fermi velocity have been discovered so far. Herein, we report the design of an organic monolayer with C4N3H stoichiometry that 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 the largest velocity ever reported in 2D organic Dirac materials, and it is comparable to that in graphene. The Dirac states in this monolayer arise from the extended p-electron conjugation system formed by the overlapping 2p(z) orbitals of carbon and nitrogen atoms. Our finding paves the way to a search for more 2D organic Dirac materials with high Fermi velocity.