Excitons in carbon nanotubes revisited: Dependence on diameter, Aharonov-Bohm flux, and strain

被引：102

作者：

Ando, T ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2004年 / 73卷 / 12期

关键词：

carbon nanotube; graphite; exciton; band gap; electron-electron interaction; effective-mass theory; Aharonov-Bohm effect;

D O I：

10.1143/JPSJ.73.3351

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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%).

引用

页码：3351 / 3363

页数：13

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