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Velocity renormalization and Dirac cone multiplication in graphene superlattices with various barrier-edge geometries

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de Jamblinne de Meux, Albert [UCL] Leconte, Nicolas [UCL] Charlier, Jean-Christophe [UCL] Lherbier, Aurélien [UCL]

The electronic properties of one-dimensional graphene superlattices strongly depend on the atomic size and orientation of the 1D external periodic potential. Using a tight-binding approach, we show that the armchair and zigzag directions in these superlattices have a different impact on the renormalization of the anisotropic velocity of the charge carriers. For symmetric potential barriers, the velocity perpendicular to the barrier is modified for the armchair direction while remaining unchanged in the zigzag case. For asymmetric barriers, the initial symmetry between the forward and backward momentum with respect to the Dirac cone symmetry is broken for the velocity perpendicular (armchair case) or parallel (zigzag case) to the barriers. At last, Dirac cone multiplication at the charge neutrality point occurs only for the zigzag geometry. In contrast, band gaps appear in the electronic structure of the graphene superlattice with barrier in the armchair direction.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2015
Language Anglais
Journal information "Physical review. B, Condensed matter and materials physics" - Vol. 91, no.23, p. 235139 (2015)
Peer reviewed yes
Publisher American Physical Society
issn 1098-0121
e-issn 1550-235X
Publication status Publié
Affiliation UCL - SST/IMCN/NAPS - Nanoscopic Physics
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Bibliographic reference de Jamblinne de Meux, Albert ; Leconte, Nicolas ; Charlier, Jean-Christophe ; Lherbier, Aurélien. Velocity renormalization and Dirac cone multiplication in graphene superlattices with various barrier-edge geometries. In: Physical review. B, Condensed matter and materials physics, Vol. 91, no.23, p. 235139 (2015)
Permanent URL http://hdl.handle.net/2078.1/166433