Photocurrent Quantum Yield of Semiconducting Carbon Nanotubes: Dependence on Excitation Energy and Exciton Binding Energy

The exciton effects in 1-nm-wide armchair graphene nanoribbons (AGNRs) under the uniaxial strain were studied within the nonorthogonal tight-binding (TB) model, supplemented by the long-range Coulomb interactions. The obtained results show that both the excitation energy and exciton binding energy are modulated by the uniaxial strain. The variation of these energies depends on the ribbon family. In addition, the results show that the variation of the exciton binding energy is much weaker than the variation of excitation energy. Our results provide new guidance for the design of optomechanical systems based on graphene nanoribbons.

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Exciton Binding Energy in Semiconducting Single-Walled Carbon Nanotubes

The Journal of Physical Chemistry B ◽

10.1021/jp053011t ◽

2005 ◽

Vol 109 (33) ◽

pp. 15671-15674 ◽

Cited By ~ 95

Author(s):

Ying-Zhong Ma ◽

Leonas Valkunas ◽

Sergei M. Bachilo ◽

Graham R. Fleming

Keyword(s):

Carbon Nanotubes ◽

Binding Energy ◽

Single Walled Carbon Nanotubes ◽

Exciton Binding Energy ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

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Determination of the Exciton Binding Energy in Single-Walled Carbon Nanotubes

Physical Review Letters ◽

10.1103/physrevlett.96.047403 ◽

2006 ◽

Vol 96 (4) ◽

Cited By ~ 46

Author(s):

Zhenjia Wang ◽

Hermen Pedrosa ◽

Todd Krauss ◽

Lewis Rothberg

Keyword(s):

Carbon Nanotubes ◽

Binding Energy ◽

Single Walled Carbon Nanotubes ◽

Exciton Binding Energy ◽

Single Walled Carbon ◽

Walled Carbon Nanotubes

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Scaling of exciton binding energy with external dielectric function in carbon nanotubes

Physica E Low-dimensional Systems and Nanostructures ◽

10.1016/j.physe.2007.07.007 ◽

2008 ◽

Vol 40 (7) ◽

pp. 2375-2379 ◽

Cited By ~ 9

Author(s):

Andrew G. Walsh ◽

A. Nickolas Vamivakas ◽

Yan Yin ◽

Stephen B. Cronin ◽

M. Selim Ünlü ◽

...

Keyword(s):

Carbon Nanotubes ◽

Binding Energy ◽

Dielectric Function ◽

Exciton Binding Energy

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EXCITONS IN SINGLE-WALL CARBON NANOTUBES

International Journal of Nanoscience ◽

10.1142/s0219581x03001632 ◽

2003 ◽

Vol 02 (06) ◽

pp. 521-526 ◽

Cited By ~ 3

Author(s):

K. A. BULASHEVICH ◽

R. A. SURIS ◽

S. V. ROTKIN

Keyword(s):

Carbon Nanotubes ◽

Binding Energy ◽

Dielectric Function ◽

Energy Gap ◽

Random Phase ◽

Tight Binding ◽

Exciton Binding Energy ◽

Single Wall Carbon Nanotubes ◽

Tight Binding Approximation ◽

Single Wall Carbon

Excitonic states in single-wall carbon nanotubes have been studied within the tight-binding approximation. An analytical expression for the dielectric function of the nanotube has been obtained in the random phase approximation. It was demonstrated that calculations with the static dielectric function yield an overestimated exciton binding energy exceeding the nanotube energy gap. Self-consistent calculation of the exciton binding energy with the frequency-dependent dielectric function has been performed. The binding energy to energy gap ratio has been shown to have no dependence on the nanotube radius and to be a universal constant ~0.87 for given resonance integral γ0=2.7 eV .

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