Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 12, Pages 3351-3363Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.3351
Keywords
carbon nanotube; graphite; exciton; band gap; electron-electron interaction; effective-mass theory; Aharonov-Bohm effect
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Optical spectra are calculated in semiconducting carbon nanotubes in the presence of magnetic flux and strain within a k(.)P scheme. The exciton absorption energies show an extra logarithmic dependence on the diameter after being scaled by the inverse diameter, coming from that of the enhancement of the band gaps. The exciton binding energy remains almost independent of the extra dependence. The ratio of the absorption energies of the first and second bands is similar to1.8 for the wide range of the effective interaction parameter. By the Coulomb interaction, the Aharonov-Bohm splitting in small magnetic flux is enhanced (5-10%) and the shift due to strain is also enhanced (10-20%).
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