2024-03-29T15:35:31Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1318762017-02-27T11:27:55Zcom_10261_10252com_10261_3col_10261_10253
Velocity renormalization and Dirac cone multiplication in graphene superlattices with various barrier-edge geometries
Jamblinne de Meux, A. de
Leconte, Nicolás
Charlier, Jean-Christopher
Lherbier, Aurélien
European Commission
Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles)
Fédération Wallonie-Bruxelles
Agence Nationale de la Recherche (France)
Under the terms of the Creative Commons Attribution License 3.0 (CC-BY).
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.
2016-05-09T10:30:10Z
2016-05-09T10:30:10Z
2015
2016-05-09T10:30:11Z
artículo
Physical Review B 91(23): 235139 (2015)
http://hdl.handle.net/10261/131876
10.1103/PhysRevB.91.235139
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100002661
http://dx.doi.org/10.13039/501100001665
http://dx.doi.org/10.13039/501100002910
eng
Publisher's version
http://dx.doi.org/10.1103/PhysRevB.91.235139
No
info:eu-repo/grantAgreement/EC/FP7/604391
http://creativecommons.org/licenses/by/3.0/
openAccess
American Physical Society