Conductance quantization and transport gaps in disordered graphene nanoribbons
By E. Mucciolo, A. C. Castro Neto, C. Lewenkopf. 2008
249 citations recorded by the source corpus.
We study numerically the effects of edge and bulk disorder on the conductance of graphene nanoribbons. We compute the conductance suppression due to Anderson localization induced by edge scattering and find that even for weak edge roughness, conductance steps are suppressed and transport gaps are induced. These gaps are approximately inversely proportional to the nanoribbon width. On/off conductance ratios grow exponentially with the nanoribbon length. Our results impose severe limitations to the use of graphene in ballistic nanowires.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/64d260f60d146002cdd07fa89a95a878e14b5341
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In Atomic and Molecular Physics, and Optics
In Electrical and Electronic Engineering
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Citations in the corpus
- Charge transport in disordered graphene-based low dimensional materials (2008, background): “This is attributed to a small gap opening as a result of the crossing of the two bands around E=0 [36] and whose width is inversely proportional to the width of the ribbon [141].”
- Performance Comparison of Graphene Nanoribbon FETs With Schottky Contacts and Doped Reservoirs (2008, background): “roughness can play an important role on device performance [22]–[24].”
- Topological origin of subgap conductance in insulating bilayer graphene (2010, background): “Structural edge disorder is generated by removing randomly tight-binding sites in the two layers [24], up to a depth d from the starting edge (see examples in Fig.”
- Electronic transport in two-dimensional graphene (2010, background): “C.2, edge disorder can cause the Anderson localization of electrons (Mucciolo et al., 2009).”
- New directions in science and technology: two-dimensional crystals (2011, background): “Unfortunately, graphene is very sensitive to edge disorder (this has to do with the slow decay of the electronic wavefunctions away from the edge [12]) and the gaps that are currently observed in experiments [34, 35] are not spectral gaps (they are not gaps between valence and conduction bands), but”
- Quantized conductance of a suspended graphene nanoconstriction (2011, background): “In such a narrow and long ribbon an edge disorder of typically only a few per cent of missing carbon atoms will prevent the observation of quantum ballistic transport and conductance quantizatio”
- Colloquium: The transport properties of graphene: An introduction (2010, background): “…massless Dirac electrons cannot also localize (Anderson localization) (Cheianov and Fal’ko, 2006; Katsnelson et al., 2006; Lewenkopf et al., 2008; Mucciolo et al., 2009) under the effect of the random electrostatic potential (long-range scatterers) creating the puddles; this accounts for the…”
- Impact of Size Effect on Graphene Nanoribbon Transport (2010, background): “Metallic armchair and zigzag GNRs with edge roughness of just a few atoms exhibit significant conductance fluctuations[7]; in addition, even for metallic zigzag ribbons, a transport gap opens up for small widths.”
- Electronic properties of mesoscopic graphene structures: Charge confinement and control of spin and charge transport (2011, background): “The armchair nanoribbons are more sensitive to edge disorder than the zigzag nanoribbons [107,110].”