Journal
PHYSICAL REVIEW B
Volume 85, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.235424
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Funding
- Brazilian agencies FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- Portuguese agency FCT (Fundacao para a Ciencia e Tecnologia) [PTDC/FIS/100968/2008]
- Deutsche Forschungsgemeinschaft [SFB 634]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/100968/2008] Funding Source: FCT
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In the present work, we investigate how structural defects in graphene can change its transport properties. In particular, we show that breaking of the sublattice symmetry in a graphene monolayer overcomes the Klein effect, leading to confined states of massless Dirac fermions. Experimentally, this corresponds to chemical bonding of foreign atoms to carbon atoms, which attach themselves to preferential positions on one of the two sublattices. In addition, we consider the scattering off a tensor barrier, which describes the rotation of the honeycomb cells of a given region around an axis perpendicular to the graphene layer. We demonstrate that in this case the intervalley mixing between the Dirac points emerges, and that Klein tunneling occurs.
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