Coherent transport in graphene nanoconstrictions

By F. Muñoz-Rojas, David Jacob, J. Fernández-Rossier, J. J. Palacios. 2006

140 citations recorded by the source corpus.

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 oneorbital 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 e 2 /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.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/3343dfb976e61618d14a555cfada9385a49e1449

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

In Materials Chemistry

Citations in the corpus

Quantized conductance of a suspended graphene nanoconstriction (2011, background): “Conductance quantization in zero magnetic field in graphene ribbons is expected to strongly depend on the type of edge terminatio”
Compact Physics-Based Circuit Models for Graphene Nanoribbon Interconnects (2009, methodology): “The self energy is computed through recursive iterations, taking advantage of the semiinfinite nature of the contacts [ 28 ].”
The electronic properties of graphene (2007, background): “This implies that a pre ursorstru ture for lo alized states at the Dira energy anbe found in ribbons or onstri tions of small lengths(Muñoz-Rojas et al., 2006), whi h modi es the ele troni stru ture and transport properties.”