Large radius exciton in single-walled carbon nanotubes
arXiv:0704.2399 · doi:10.1088/1751-8113/40/34/009
Abstract
The spectrum of large radius exciton in an individual semiconducting single-walled carbon nanotube (SWCNT) is described within the framework of elementary potential model, in which exciton is modeled as bound state of two oppositely charged quasi-particles confined on the tube surface. Due to the parity of the interaction potential the exciton states split into the odd and even series. It is shown that for the bare and screened Coulomb electron-hole (e-h) potentials the binding energy of even excitons in the ground state well exceeds the energy gap. The factors preventing the collapse of single-electron states in isolated semiconducting SWCNTs are discussed.
14 pages, 1 figure, 5 tables
References in corpus (4)
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- Electron-electron interaction effects on optical excitations in semiconducting single-walled carbon nanotubes
- Excitons in carbon nanotubes: an ab initio symmetry-based approach
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