Modulating magnetism of nitrogen-doped zigzag graphene nanoribbons

作     者：赵尚骞 吕燕 吕文刚 梁文杰 王恩哥 

作者机构：Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics International Center for Quantum Materials School of Physics Peking University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2014年第23卷第6期

页      面：507-513页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.10834012 and 11374342) National Key Basic Research and Development Program of China(Grant No.2009CB930700) the Knowledge Innovation Foundation of the Chinese Academy of Sciences(Grant No.KJCX2-YW-W35) 

主　　题：graphene nanoribbons charge doping spin-polarization spatial localization 

摘      要：We present a study of electronic properties of zigzag graphene nanoribbons （ZGNRs） substitutionally doped with nitrogen atoms at a single edge by first principle calculations. We find that the two edge states near the Fermi level sepa- rate due to the asymmetric nitrogen-doping. The ground states of these systems become ferromagnetic because the local magnetic moments along the undoped edges remain and those along the doped edges are suppressed. By controlling the charge-doping level, the magnetic moments of the whole ribbons are modulated. Proper charge doping leads to interest- ing half-metallic and single-edge conducting ribbons which would be helpful for designing graphene-nanoribbon-based spintronic devices in the future.