Effects of valley mixing and exchange on excitons in carbon nanotubes with Aharonov-Bohm flux

被引：141

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 | 2006年 / 75卷 / 02期

关键词：

carbon nanotube; Aharonov-Bohm effect; exciton; effective-mass theory; exchange effect; intervalley mixing;

D O I：

10.1143/JPSJ.75.024707

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Because of the presence of two valleys and the electron spin, the exciton states have a degeneracy of 16 in the lowest order k (.) p approximation. Due to a weak short-range part of the Coulomb interaction, they are split into several levels, leaving only a single optically-active bright level and making all others optically-inactive or dark. Their ordering and energy splitting are shown to be determined by two parameters characterizing the short-range interaction, sensitive to detailed form of the potential and wave function. The presence of a magnetic flux through the cross section, accessible experimentally, modifies these energy levels strongly and causes the appearance of two bright excitons.

引用

页数：12

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