Observation of Charged Excitons in Hole-Doped Carbon Nanotubes Using Photoluminescence and Absorption Spectroscopy
Observation of Charged Excitons in Hole-Doped Carbon Nanotubes Using Photoluminescence and Absorption Spectroscopy
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DOI：
10.1103/physrevlett.106.037404
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发表时间：
2011-01-18
影响因子：
8.6
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Matsunaga, Ryusuke;Matsuda, Kazunari;Kanemitsu, Yoshihiko
我们报告了室温下空穴掺杂碳纳米管中首次观察到的三粒子（带电激子），即由一个电子和两个空穴组成的三粒子束缚态。当 p 型掺杂剂添加到碳纳米管溶液中时，无论掺杂剂种类如何，三重子的光致发光和吸收峰都远低于 E-11 亮激子峰。亮激子和三重子之间出乎意料的大能量分离归因于碳纳米管中强烈的电子空穴交换相互作用。
We report the first observation of trions (charged excitons), three-particle bound states consisting of one electron and two holes, in hole-doped carbon nanotubes at room temperature. When p-type dopants are added to carbon nanotube solutions, the photoluminescence and absorption peaks of the trions appear far below the E-11 bright exciton peak, regardless of the dopant species. The unexpectedly large energy separation between the bright excitons and the trions is attributed to the strong electron-hole exchange interaction in carbon nanotubes.