期刊
PHYSICAL REVIEW B
卷 84, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.195434
关键词
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资金
- Dutch Science Foundation NWO/FOM
- Eurocores program EuroGraphene
- ERC
Edge reconstruction modifies the electronic properties of finite graphene samples. We formulate a low-energy theory of the reconstructed zigzag edge by deriving the modified boundary condition to the Dirac equation. If the unit-cell size of the reconstructed edge is not a multiple of three with respect to the zigzag unit cell, valleys remain uncoupled and the edge reconstruction is accounted for by a single angular parameter (sic). Dispersive edge states exist generically, unless vertical bar(sic)vertical bar = pi/2. We compute (sic) from a microscopic model for the reczag reconstruction (conversion of two hexagons into a pentagon-heptagon pair), and show that it can be measured via the local density of states. In a magnetic field, there appear three distinct edge modes in the lowest Landau level, two of which are counterpropagating.
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