Modulating magnetism of nitrogen-doped zigzag graphene nanoribbons  

作　　者：赵尚骞 吕燕 吕文刚 梁文杰 王恩哥 

机构地区：[1]Institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics [2]International Center for Quantum Materials, School of Physics, Peking University

出　　处：《Chinese Physics B》2014年第6期507-513,共7页中国物理B（英文版）

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)

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.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.

关 键 词：graphene nanoribbons charge doping SPIN-POLARIZATION spatial localization 

分 类 号：O562[理学—原子与分子物理]