pi-Electron theory of transverse optical excitons in semiconducting single-walled carbon nanotubes

Details pi-Electron theory of transverse optical excitons in semiconducting single-walled carbon nanotubes pi-Electron theory of transverse optical excitons in semiconducting single-walled carbon nanotubes

2007-05-16

arxiv.org/abs/0705.2260v2

Phys. Rev. B 76, 115431 (2007)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures. to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.76.115431

We present a quantitative theory of optical absorption polarized transverse to the tube axes in semiconducting single-walled carbon nanotubes. Transverse optical absorption in semiconducting single-walled carbon nanotubes is to an exciton state that is strongly blueshifted, relative to the two lowest longitudinal excitons, by electron-electron interactions. The binding energy of the transverse exciton is considerably smaller than those of the longitudinal excitons. Electron-electron interactions also reduce the relative oscillator strength of the transverse optical absorption. Our theoretical results are in excellent agreement with recent experimental measurements in four chiral nanotubes.

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