Coherent transport in graphene nanoconstrictions
Contribuinte(s) |
Universidad de Alicante. Departamento de Física Aplicada Grupo de Nanofísica |
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Data(s) |
21/11/2012
21/11/2012
14/11/2006
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Resumo |
We study the effect of a structural nanoconstriction on the coherent transport properties of otherwise ideal zigzag-edged infinitely long graphene ribbons. The electronic structure is calculated with the standard one-orbital tight-binding model and the linear conductance is obtained using the Landauer formula. We find that, since the zero-bias current is carried in the bulk of the ribbon, this is very robust with respect to a variety of constriction geometries and edge defects. In contrast, the curve of zero-bias conductance versus gate voltage departs from the (2n+1)e2∕h staircase of the ideal case as soon as a single atom is removed from the sample. We also find that wedge-shaped constrictions can present nonconducting states fully localized in the constriction close to the Fermi energy. The interest of these localized states in regards to the formation of quantum dots in graphene is discussed. This work has been financially supported by MEC-Spain (Grants No. FIS200402356, No. MAT2005-07369-C03-01, and the Ramon y Cajal Program) and by Generalitat Valenciana (GV05-152). This work has been partly funded by FEDER funds. |
Identificador |
MUÑOZ-ROJAS, F., et al. “Coherent transport in graphene nanoconstrictions”. Physical Review B. Vol. 74, No. 19 (2006). ISSN 1098-0121, pp. 195417-1/8 1098-0121 (Print) 1550-235X (Online) http://hdl.handle.net/10045/25226 10.1103/PhysRevB.74.195417 |
Idioma(s) |
eng |
Publicador |
American Physical Society |
Relação |
http://dx.doi.org/10.1103/PhysRevB.74.195417 |
Direitos |
© 2006 The American Physical Society info:eu-repo/semantics/openAccess |
Palavras-Chave | #Coherent transport #Structural nanoconstriction #Graphene #Quantum dots #Física de la Materia Condensada |
Tipo |
info:eu-repo/semantics/article |