English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/131876
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


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

AuthorsJamblinne de Meux, A. de; Leconte, Nicolás ; Charlier, Jean-Christopher; Lherbier, Aurélien
Issue Date2015
PublisherAmerican Physical Society
CitationPhysical Review B 91(23): 235139 (2015)
AbstractThe 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.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.91.235139
Identifiersdoi: 10.1103/PhysRevB.91.235139
issn: 2469-9950
e-issn: 2469-9969
Appears in Collections:(CIN2) Artículos
Files in This Item:
File Description SizeFormat 
Dirac cone.pdf1,85 MBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.