Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 79, Issue 2, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.79.024706
Keywords
carbon nanotube; exciton; image potential; effective-mass theory; dielectric constant; trigonal warping; curvature; lattice distortion
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Funding
- Ministry of Education, Culture, Sports, Science and Technology Japan
- Grants-in-Aid for Scientific Research [19054004] Funding Source: KAKEN
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Effects of environmental dielectric screening on excitons in carbon nanotubes are studied within a k.p scheme and a continuum model. They ire shown to be sensitive to the effective distance between the nanotube and the dielectric medium relative to the diameter. For material surrounding the nanotube, the band gap decreases with the increase of the dielectric constant, but the energy of the ground exciton exhibits only slight decrease for effective distance comparable to interlayer spacing of bulk graphile. The binding energy of excited exciton states disappears rapidly. For dielectric material inside the nanotube, effects ire much weaker and excited exciton states remain as bound states even for very large dielectric constant.
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