Electronic and Optical Properties of Narrow-Gap Carbon Nanotubes
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概要
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The sp^3 tight-binding model is used to calculate electronic structures of narrow-gap carbon nanotubes. The curvature effects cause a small energy gap, a one-dimensional parabolic bands, and a shift in the Fermi wave vector. The energy gap is described by the approximate relation E_g ≃ 5|V_<ppπ>|b^2cos(3θ)/16R^2_d. It is almost identical to the first-principles result. Due to the curvature effects, the optical spectra exhibit single-particle absorption peaks and a plasmon structure. They are consistent with the experimental results, the absorption peaks in the optical conductivity and the plasmon edge in the reflectance spectrum, thereby verifing the relation between E_g and (R_d,θ).
- 社団法人日本物理学会の論文
- 2002-08-15
著者
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Shyu F.
Department Of Physics Chinese Military Academy
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Lin M.
Department Of Electrical Engineering National Tsing Hua University
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