期刊
NANO LETTERS
卷 17, 期 7, 页码 4400-4404出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01474
关键词
Graphene; nanoribbon; edge magnetism; metal-insulator transition; Friedel oscillation
类别
资金
- National Nature Science Foundation of China [11274276, 11674158]
- Ministry of Science and Technology of China [2016YFA0300401]
- U.S. Department of Energy (DOE), Office of Basic Energy Science [DE-SC0012704]
- Brookhaven National Laboratory
- China Scholarship Council
Quantum confinement and interference often generate exotic properties in nanostructures. One recent highlight is the experimental indication of a magnetic phase transition in zigzag-edged graphene nanoribbons at the critical ribbon width of about 7 nm [Magda, G. Z. et al. Nature 2014, 514, 608]. Here we show theoretically that with further increase in the ribbon width,,the magnetic correlation of the two edges can exhibit an intriguing oscillatory behavior between antiferromagnetic and ferromagnetic, driven by acquiring the positive coherence between the two edges to lower the free energy. The oscillation effect is readily tunable in applied magnetic fields. These novel properties suggest new experimental manifestation of the edge magnetic orders in graphene nanoribbons and enhance the hopes of graphene-like spintronic nanodevices functioning at room temperature.
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