Collective excitations in a single-layer carbon nanotube

Lin, Ming–Fa; Chuu, Der–San; Huang, Chiung‐Shiann; Lin, Yi‐Hsin; Shung, Kenneth W. K.

doi:10.1103/physrevb.53.15493

Cited by 71 publications

(35 citation statements)

References 28 publications

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“…5b) one can see that the E 11 exciton energy Ω 11 decreases by 145 meV/% while Ω 22 increases by 128 meV/%. Results for Ω 33 and Ω 44 (Table 1) give values of -157 meV/% and +75 meV/%, respectively. Thus, the qualitative trends observed from the GW calculations are maintained with the optical properties; however, because the quasiparticle bandgap and the exciton energy have a different dependence on strain, dE GW g /dσ = dΩ/dσ, one can deduce that the exciton binding energy E b = E GW g − Ω depends on strain.…”

Section: Impact Of Many-body Effects On Optical Propertiesmentioning

confidence: 98%

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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Section: Impact Of Many-body Effects On Optical Propertiesmentioning

confidence: 98%

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

Spataru

Léonard

2013

Phys. Rev. B

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“…During the past years, the collective excitations have been widely studied with different theoretical models, such as the classical hydrodynamic model 1,2 and the quantum dielectric-response model with the random-phase approximation. [3][4][5] The studies correspond to high-frequency excitations which come from electron oscillations in carbon nanotubes.…”

mentioning

confidence: 99%

Quantum ion-acoustic waves in single-walled carbon nanotubes studied with a quantum hydrodynamic model

Wang

2007

Phys. Rev. B

113

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“…7 Usually single wall carbon nanotube (SWCNT) shows two bulk plasmons (σ+π plasmon and π plasmon) and one surface plasmon near 20, 5 and 13 eV respectively. 8,9,10 Axial straining of the SWCNT shows a shift in the π plasmon frequency in case of perpendicular incidence of light. 6 The electric field localization near plasmon frequency increased to 10% when compared with parallel incidence of light.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic characteristics of Polyaniline/SWCNT composites

2013

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Electromagnetic field interactions with the composites made up of polyaniline (PANI) and single wall carbon nanotube (SWCNT) are simulated using the discrete dipole approximation. Recent observations on polymer nano-composites explain the interface interactions between the PANI host and the carbon nanostructures. These types of composite have potential applications in organic solar cell, gas sensor, bio-sensor and electro-chromic devices. Various nanostructures of PANI is possible in the form of nanowires, nanodisks, nanofibers and nanotubes have been reported. In the present study, we considered two types of composite, one is the PANI wrapped CNT and the other is CNT immersed in PANI nanotube. We use Modified Thole's parameters for calculating frequency dependent atomic polarizability of composites. Absorption spectra of the composites are studied by illuminating a wide range of electromagnetic energy spectrum. From the absorption spectra, we observe plasmon excitation in near-infrared region similar to that in SWCNTs reported recently. The interactions between the PANI and CNT in the composite, resulting electromagnetic absorptions are simulated.

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Collective excitations in a single-layer carbon nanotube

Cited by 71 publications

References 28 publications

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

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

Quantum ion-acoustic waves in single-walled carbon nanotubes studied with a quantum hydrodynamic model

Electromagnetic characteristics of Polyaniline/SWCNT composites

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