Center for Integrated Nanotechnologies, Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Department of Physics and Engineering Physics, Fordham University, Bronx, New York 10458, USA.
Phys Rev Lett. 2015 Jul 3;115(1):017401. doi: 10.1103/PhysRevLett.115.017401. Epub 2015 Jul 2.
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.
在室温下对单个单壁碳纳米管 (SWCNT) 进行了依赖于泵浦的光致发光成像和二阶光子相关研究。这些研究使我们能够提取激子扩散常数和俄歇复合系数。这些参数之间的线性相关性归因于环境无序对激子平均自由程的影响以及在该长度尺度下限制捕获的俄歇复合。光子反聚束的抑制归因于在 SWCNT 中创建多个空间上不重叠的激子，其扩散长度短于激光光斑尺寸。我们得出结论，室温下完全反聚束需要增强激子-激子湮灭速率，这在允许强激子定位的 SWCNT 中可能成为现实。
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