Uniaxial-stress effects on the electronic properties of carbon nanotubes

Heyd, Rodolphe; Charlier, A.; McRae, E.

doi:10.1103/physrevb.55.6820

Cited by 223 publications

(149 citation statements)

References 29 publications

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“…Hence, the 17 cm 1 shift in the G band frequency of EG compared to that of bulk graphite or MCG corresponds to a biaxial stress of 2.27 GPa on EG. The strong compressive stress may affect both the physical and electronic properties of graphene, analogous to what occurs for CNTs [63,64]. Raman spectra of few layer epitaxial graphene on SiC substrates have also been reported by Faugeras et al [71] and no blueshift of the G band was observed.…”

Section: Nano Researchmentioning

confidence: 71%

Raman spectroscopy and imaging of graphene

et al. 2008

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Graphene has many unique properties that make it an ideal material for fundamental studies as well as for potential applications. Here we review recent results on the Raman spectroscopy and imaging of graphene. We show that Raman spectroscopy and imaging can be used as a quick and unambiguous method to determine the number of graphene layers. The strong Raman signal of single layer graphene compared to graphite is explained by an interference enhancement model. We have also studied the effect of substrates, the top layer deposition, the annealing process, as well as folding (stacking order) on the physical and electronic properties of graphene. Finally, Raman spectroscopy of epitaxial graphene grown on a SiC substrate is presented and strong compressive strain on epitaxial graphene is observed. The results presented here are highly relevant to the application of graphene in nano-electronic devices and help in developing a better understanding of the physical and electronic properties of graphene.

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Section: Nano Researchmentioning

confidence: 71%

Raman spectroscopy and imaging of graphene

et al. 2008

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“…Indeed, it was recognized early on [12,13] that strain can significantly modify CNT electronic properties, and this has been exploited to realize new types of nanoelectromechanical devices [14]. However, to date theoretical studies of the impact of strain on CNT electronic properties have been mostly limited to tight-binding models and DFT; given the importance of many-body effects in unstrained CNTs, a question to address is the role of many-body effects in strained CNTs.…”

Section: Introductionmentioning

confidence: 99%

Many-body effects on the electronic and optical properties of strained semiconducting carbon nanotubes

Spataru

Léonard

2013

Phys. Rev. B

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We present many-body ab initio calculations of the electronic and optical properties of semiconducting zigzag carbon nanotubes under uniaxial strain. The GW approach is utilized to obtain the quasiparticle bandgaps and is combined with the Bethe-Salpeter equation to obtain the optical absorption spectrum. We find that the dependence of the electronic bandgaps on strain is more complex than previously predicted based on tight-binding models or density-functional theory. In addition, we show that the exciton energy and exciton binding energy depend significantly on strain, with variations of tens of meVs per percent strain, but that despite these strong changes the absorbance is found to be nearly independent of strain. Our results provide new guidance for the understanding and design of optomechanical systems based on carbon nanotubes.

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“…If we set ␦x = ␦y = 0, we can write all distortions as ␦x l = b l ͑1+ ͒tan ␣ − a l and ␦y l = b l , which have been used previously in some theoretical calculations. [13][14][15] While this simplification is valid for specific cases, it cannot describe the general case since for longitudinal strains it incorrectly assumes that ␦x l is proportional to a l and not influenced by b l . However, in an armchair CNT, for example, 1 lies along the x axis so intuitively we would expect a longitudinal strain to mainly influence the vectors 2,3 , while having little effect on 1 .…”

Section: ͑10͒mentioning

confidence: 99%

“…Theoretical studies of strained CNT find that the band gap will oscillate between zero and nonzero values as the strain is increased, in agreement with the experimental results. [13][14][15][16][17][18][19] However, most of these theoretical studies tend to assume that the CNT lattice vectors distort like solid object vectors. Here, as an example of how to apply our general rule for metallic CNT, we consider a CNT under small axial and torsional strains, where small implies that the applied strains are not sufficient to cause buckling or kinking, 20,21 while taking into account the fact that lattices do not distort like solid objects.…”

Section: Introductionmentioning

confidence: 99%

Electronic properties of carbon nanotubes with distinct bond lengths

Bunder

Hill

2010

Journal of Applied Physics

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In band structure calculations commonly used to derive the electronic properties of carbon nanotubes it is generally assumed that all bond lengths are equal. However, hexagonal carbon lattices are often irregular and may contain as many as three distinct bond lengths. A regular $(n,m)$ carbon nanotube will be metallic if p=(n-m)/3 for integer p. Here we analytically derive the generalized condition for metallic irregular carbon nanotubes. This condition is particularly relevant to small radius nanotubes and nanotubes experiencing small applied strains. In band structure calculations commonly used to derive the electronic properties of carbon nanotubes, it is generally assumed that all bond lengths are equal. However, hexagonal carbon lattices are often irregular and may contain as many as three distinct bond lengths. A regular ͑n , m͒ carbon nanotube will be metallic if p = ͑n − m͒ / 3 for integer p. Here we analytically derive the generalized condition for metallic irregular carbon nanotubes. This condition is particularly relevant to small radius nanotubes and nanotubes experiencing small applied strains.

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Uniaxial-stress effects on the electronic properties of carbon nanotubes

Cited by 223 publications

References 29 publications

Raman spectroscopy and imaging of graphene

Raman spectroscopy and imaging of graphene

Many-body effects on the electronic and optical properties of strained semiconducting carbon nanotubes

Electronic properties of carbon nanotubes with distinct bond lengths

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