Exciton in twisted single-walled carbon nanotube

被引：0

作者：

Lu, Yan ^{[2
]}

Liu, Hong ^{[1
,2
]}

Gu, Bing ^{[2
]}

Duan, Wenhui ^{[3
]}

Luo, Chenglin ^{[2
]}

机构：

[1] Univ Paderborn, Dept Phys, Warburger Str 100, D-33098 Paderborn, Germany

[2] Nanjing Normal Univ, Dept Phys, Nanjing 210046, Jiangsu, Peoples R China

[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 4 | 2011年 / 8卷 / 04期

基金：

中国国家自然科学基金;

关键词：

single-walled; carbon nanotube; exciton; torsion deformation; nanoswitch;

D O I：

10.1002/pssc.201000709

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We study the exciton effect of twisted single-walled carbon nanotubes (SWNTs) within the tight-binding approximation and including the electron-electron Coulomb interaction. We obtain an approximate relationship that can describe the variation of the band gap of SWNTs with the torsion angle. Based on this relationship, we can divide SWNTs into three kinds according to the different behaviors of band gap at the small torsion angle. Furthermore, specially for metallic SWNTs, the exciton binding energies can rapidly increase to 0.2 eV under small torsion angle, like a switch on the control of generation of exciton in metallic SWNTs. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1190 / 1193

页数：4

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