期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.086601
关键词
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资金
- EuroMagNET [228043]
- NANOSIM-GRAPHENE Project [ANR-09-NANO-016-01]
- MAGBiSy Project [ANR-08-JCJC-0034-01]
- Fondation Nanosciences
- ICREA Funding Source: Custom
We perform magnetotransport measurements in lithographically patterned graphene nanoribbons down to a 70 nm width. The electronic spectrum fragments into an unusual Landau levels pattern, characteristic of Dirac fermion confinement. The two-terminal magnetoresistance reveals the onset of magnetoelectronic subbands, edge currents and quantized Hall conductance. We bring evidence that the magnetic confinement at the edges unveils the valley degeneracy lifting originating from the electronic confinement. Quantum simulations suggest some disorder threshold at the origin of mixing between chiral magnetic edge states and disappearance of quantum Hall effect.
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