Disorder-induced pseudodiffusive transport in graphene nanoribbons

Dietl, Petra; Metalidis, G.; Golubev, Dmitri S.; San-José, Pablo; Prada, Elsa; Schomerus, Henning; Schön, Gerd

doi:10.1103/physrevb.79.195413

Cited by 13 publications

(13 citation statements)

References 27 publications

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“…The persistence of the T = 1 plateau in the symmetric case has been observed previously [34]. In general, AGNRs are more sensitive to edge disorders than the bulk substitutional disorder considered here [31,41].…”

Section: Resultssupporting

confidence: 77%

“…This is important since CVD-grown graphene contains extended edgelike defects in the form of grain boundaries [25][26][27][28], unlike bottom-up approaches which may allow the synthesis of more precise geometries [29]. We are further motivated by the strong dependence of GNR transport on edge geometry and impurity distribution [30][31][32][33][34][35][36][37][38][39][40][41][42][43] and by sublattice dependent features in carbon nanotubes [44,45]. We consider both armchair-(AGNR) and zigzag-(ZGNR) edged ribbons, noting the in-built sublattice asymmetry of ZGNRs due to sites along one edge belonging to one sublattice.…”

Section: Introductionmentioning

confidence: 99%

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Electronic transport in graphene nanoribbons with sublattice-asymmetric doping

2016

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Recent experimental findings and theoretical predictions suggest that nitrogen-doped CVD-grown graphene may give rise to electronic band gaps due to impurity distributions which favour segregation on a single sublattice. Here we demonstrate theoretically that such distributions lead to more complex behaviour in the presence of edges, where geometry determines whether electrons in the sample view the impurities as a gap-opening average potential or as scatterers. Zigzag edges give rise to the latter case, and remove the electronic bandgaps predicted in extended graphene samples. We predict that such behaviour will give rise to leakage near grain boundaries with a similar geometry or in zigzag-edged etched devices. Furthermore, we examine the formation of one-dimensional metallic channels at interfaces between different sublattice domains, which should be observable experimentally and offer intriguing waveguiding possibilities.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Electronic transport in graphene nanoribbons with sublattice-asymmetric doping

2016

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“…A similar situation can be observed in the case of substitutionally doped graphene nanoribbons of which the transport properties has attracted much theoretical attention recently 32–39. As shown in Ref.…”

Section: Substitutional Doping Of Nanotubes Nanowires and Graphenesupporting

confidence: 67%

Conductance of functionalized nanotubes, graphene and nanowires: from ab initio to mesoscopic physics

Blase

Adessi

Biel

et al. 2010

Physica Status Solidi (b)

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We review recent theoretical results aiming at understanding the impact of doping and functionalization on the electronic transport properties of nanotubes, nanowires and graphene ribbons. On the basis of ab initio calculations, the conductance of micrometer long tubes or ribbons randomly doped or grafted can be studied, allowing to extract quantities at mesoscopic length scales such as the elastic mean free path and localization length. While the random modification of a 1D conducting channel leads generaly to a significant loss of conductance, strategies can be found to either exploit or limitate such a detrimental effect. Spin-filtering in transition metal doped nanotubes, the opening of a mobility gap in graphene ribbons, and the choice of molecules to limitate backscattering in covalently functionalized tubes are examples that will be discussed.Symbolic representation of a nanotube filled with Cobalt atoms or clusters with subsequent optimal spinvalve effect (see text).

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“…zig-zag or armchair direction) as required by the theory. These discrepancies have prompted sev- eral studies (Abanin and Levitov, 2008;Areshkin et al, 2007;Basu et al, 2008;Biel et al, 2009a,b;Chen et al, 2007;Dietl et al, 2009;Martin and Blanter, 2009;Sols et al, 2007;Stampfer et al, 2009;Todd et al, 2009). In particular, Sols et al (2007) argued that fabrication of the nanoribbons gave rise to very rough edges breaking the nanoribbon into a series of quantum dots.…”

Section: Graphene Nanoribbonsmentioning

confidence: 99%

Electronic transport in two dimensional graphene

Sarma,

Adam,

Hwang

et al. 2010

Preprint

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We provide a broad review of fundamental electronic properties of two-dimensional graphene with the emphasis on density and temperature dependent carrier transport in doped or gated graphene structures. A salient feature of our review is a critical comparison between carrier transport in graphene and in two-dimensional semiconductor systems (e.g. heterostructures, quantum wells, inversion layers) so that the unique features of graphene electronic properties arising from its gapless, massless, chiral Dirac spectrum are highlighted. Experiment and theory as well as quantum and semi-classical transport are discussed in a synergistic manner in order to provide a unified and comprehensive perspective. Although the emphasis of the review is on those aspects of graphene transport where reasonable consensus exists in the literature, open questions are discussed as well. Various physical mechanisms controlling transport are described in depth including long-range charged impurity scattering, screening, short-range defect scattering, phonon scattering, many-body effects, Klein tunneling, minimum conductivity at the Dirac point, electron-hole puddle formation, p-n junctions, localization, percolation, quantum-classical crossover, midgap states, quantum Hall effects, and other phenomena.

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Disorder-induced pseudodiffusive transport in graphene nanoribbons

Cited by 13 publications

References 27 publications

Electronic transport in graphene nanoribbons with sublattice-asymmetric doping

Electronic transport in graphene nanoribbons with sublattice-asymmetric doping

Conductance of functionalized nanotubes, graphene and nanowires: from ab initio to mesoscopic physics

Electronic transport in two dimensional graphene

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