Jiang, J and Saito, R and Samsonidze, Ge. G. and Jorio, Ado and Chou, S. G. and Dresselhaus, G and Dresselhaus, Mildred S. (2007) Chirality dependence of exciton effects in single-wall carbon nanotubes: Tight-binding model. PHYSICAL REVIEW B, 75 (3).
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.75.035407
We have studied the exciton properties of single-wall carbon nanotubes by solving the Bethe-Salpeter equation within tight-binding models. The screening effect of the pi electrons in carbon nanotubes is treated within the random phase and static screened approximations. The exciton wave functions along the tube axis and circumference are discussed as a function of (n,m). A 2n+m=const family behavior is found in the exciton wave function length, excitation energy, binding energy, and environmental shift. This family behavior is understood in terms of the trigonal warping effect around the K point of a graphene layer and curvature effects. The large family spread in the excitation energy of the Kataura plot is found to come from the single-particle energy.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanostructured materials
|Deposited By:||Anuj Seth|
|Deposited On:||13 Jan 2009 15:00|
|Last Modified:||19 Feb 2009 17:54|
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