Influences of Exciton Diffusion and Exciton-Exciton Annihilation on Photon Emission Statistics of Carbon Nanotubes

被引：33

作者：

Ma, Xuedan ^{[1
]}

Roslyak, Oleskiy ^{[1
,5
]}

Duque, Juan G. ^{[2
]}

Pang, Xiaoying ^{[3
]}

Doorn, Stephen K. ^{[1
]}

Piryatinski, Andrei ^{[4
]}

Dunlap, David H. ^{[6
]}

Htoon, Han ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Mat Phys & Applicat Div, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Div Chem, Phys Chem & Appl Spect, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, Accelerator Operat & Technol Div, High Power Electrodynam, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[5] Fordham Univ, Dept Phys & Engn Phys, Bronx, NY 10458 USA

[6] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 01期

关键词：

ELECTRONIC-STRUCTURE; FLUORESCENCE;

D O I：

10.1103/PhysRevLett.115.017401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Pump-dependent photoluminescence imaging and second-order photon correlation studies have been performed on individual single-walled carbon nanotubes (SWCNTs) at room temperature. These studies enable the extraction of both the exciton diffusion constant and the Auger recombination coefficient. A linear correlation between these parameters is attributed to the effect of environmental disorder in setting the exciton mean free path and capture-limited Auger recombination at this length scale. A suppression of photon antibunching is attributed to the creation of multiple spatially nonoverlapping excitons in SWCNTs, whose diffusion length is shorter than the laser spot size. We conclude that complete antibunching at room temperature requires an enhancement of the exciton-exciton annihilation rate that may become realizable in SWCNTs allowing for strong exciton localization.

引用

页数：6

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