Modulating magnetism of nitrogen-doped zigzag graphene nanoribbons

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...

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Published inChinese physics B Vol. 23; no. 6; pp. 507 - 513
Main Author 赵尚骞 吕燕 吕文刚 梁文杰 王恩哥
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
Charge
Devices
Ferromagnetism
Graphene
Magnetic moment
Nanostructure
Nitrogen atoms
Ribbons
氮掺杂
电子性质
石墨
磁调制
第一原理计算
纳米带
自旋电子器件
锯齿形
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Summary: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.
Bibliography:Zhao Shang-Qian, Lii Yan, Lu Wen-Gang, Liang Wen-Jie, Wang En-Ge（ a）institute of Physics, Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China b） International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
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.
graphene nanoribbons, charge doping, spin-polarization, spatial localization
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/6/067305