Huang Libai, Krauss Todd D
Department of Chemistry, University of Rochester, Rochester, New York 14267, USA.
Phys Rev Lett. 2006 Feb 10;96(5):057407. doi: 10.1103/PhysRevLett.96.057407. Epub 2006 Feb 9.
Auger-like exciton-exciton annihilation in isolated single-walled carbon nanotubes (SWNTs) has been studied by femtosecond transient absorption spectroscopy. We observe a quantization of the Auger recombination process and extract dynamics for 2 and 3 electron-hole pair excited states. We further demonstrate that Auger recombination in SWNTs is a two-particle process involving strongly bound excitons and not a three-particle Auger process involving unbound electrons and holes. We thus provide explicit experimental evidence for one-dimensional discrete excitons in SWNTs.
通过飞秒瞬态吸收光谱法研究了孤立单壁碳纳米管（SWNTs）中类俄歇激子-激子湮灭过程。我们观察到俄歇复合过程的量子化，并提取了双电子-空穴对和三电子-空穴对激发态的动力学信息。我们进一步证明，单壁碳纳米管中的俄歇复合是一个涉及强束缚激子的双粒子过程，而不是一个涉及自由电子和空穴的三粒子俄歇过程。因此，我们为单壁碳纳米管中的一维离散激子提供了明确的实验证据。
