Quantum conductance of carbon nanotubes with defects

We study graphene nanoribbons and carbon nanotubes containing ordered defect lines built of octagonal rings. We show that octagonal defect lines are a robust source of state localization at the Fermi energy, in some cases leading to spontaneous magnetization. We also prove that the localization at chains of octagons is a consequence of the zigzag nature of the graphene edges forming the defect lines.

show abstract

“…A Green function matching approach is used to obtain the local density of states (LDOS). 23 Our main results are the following:…”

Section: Introductionmentioning

confidence: 99%

Grain boundaries with octagonal defects in graphene nanoribbons and nanotubes

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Their electronic and transmission properties have been studied both experimentally [4][5][6][7][8] and theoretically. [9][10][11][12][13] In particular, from the theoretical point of view, the sensitivity of their electronic properties to their geometry makes them truly unique in offering the possibility of studying quantum transport in a very tunable environment.…”

Section: Introductionmentioning

confidence: 99%

“…Saito et al 10 studied the tunneling conductance of connected carbon nanotubes via the direct calculation of the current density. Chico et al 11 addressed the problem of quantum conductance in carbon nanotubes with defects, efficiently combining a surface Green's-function approach 14 to describe the interface between different tubes with a scattering matrix-based calculation of the transmission function, thus obtaining the conductance via a multichannel generalization of the Landauer formula. The variation of the conductance with the diameter of the carbon nanotubes has been studied by Tamura and Tsukada.…”

Section: Introductionmentioning

confidence: 99%

Electronic transport in extended systems: Application to carbon nanotubes

1999

View full text Add to dashboard Cite

We present an efficient approach to describe the electronic transport properties of extended systems. The method is based on the surface Green's function matching formalism and combines the iterative calculation of transfer matrices with the Landauer formula for the coherent conductance. The scheme is applicable to any general Hamiltonian that can be described within a localized orbital basis. As illustrative examples, we calculate transport properties for various ideal and mechanically deformed carbon nanotubes using realistic orthogonal and nonorthogonal tight-binding models. In particular, we observe that bent carbon nanotubes maintain their basic electrical properties even in the presence of large mechanical deformations.

show abstract

“…8 We first note that with this model we reproduce some known results for single-tube transport: for the simplest case of a perfect nanotube we find, as expected, two channels at the Fermi level, with a maximum conductance of 2G 0 . 9 With a single vacancy present one channel is lost, 9 and with an axial magnetic field present an Aharonov-Bohm effect is seen where the resistance varies periodically with the number of flux quanta through the tube. 10 The model is thus robust enough to investigate the effects.…”

mentioning

confidence: 99%

Quantized conductance of multiwalled carbon nanotubes

Delaney

Ventra

Pantelides

1999

Applied Physics Letters

View full text Add to dashboard Cite

We report calculations of the transport properties of multiwalled carbon nanotubes based on a scattering-theoretic approach that takes into account scattering within each tube, between tubes, and at the metal contacts. We find that only the outer tube contributes to the conductance, as has been implied by experiments. Referring to experiments performed with liquid-metal contacts, we also explain why the measured conductance is close to an integer number of conductance quanta, when the tubes are immersed in the liquid metal for several hundreds of nanometers and is not an integer when they are immersed for only a few nanometers. Finally, we propose that the observed conductance of only one quantum (instead of the expected two quanta) is due to intertube interactions.

show abstract

Quantum conductance of carbon nanotubes with defects

Cited by 490 publications

References 19 publications

Grain boundaries with octagonal defects in graphene nanoribbons and nanotubes

Grain boundaries with octagonal defects in graphene nanoribbons and nanotubes

Electronic transport in extended systems: Application to carbon nanotubes

Quantized conductance of multiwalled carbon nanotubes

Contact Info

Product

Resources

About