Exciton resonances quench the photoluminescence of zigzag carbon nanotubes

被引：84

作者：

Reich, S ^{[1
]}

Thomsen, C

Robertson, J

机构：

[1] Univ Cambridge, Dept Engn, Cambridge CB2 1PZ, England

[2] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.95.077402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the photoluminescence intensity of single-walled carbon nanotubes is much stronger in tubes with large chiral angles-armchair tubes-because exciton resonances make the luminescence of zigzag tubes intrinsically weak. This exciton-exciton resonance depends on the electronic structure of the tubes and is found more often in nanotubes of the +1 family. Armchair tubes do not necessarily grow preferentially with present growth techniques; they just have stronger luminescence. Our analysis allows us to normalize photoluminescence intensities and find the abundance of nanotube chiralities in macroscopic samples.

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