Carrier multiplication in carbon nanotubes studied by femtosecond pump-probe spectroscopy
Carrier multiplication in carbon nanotubes studied by femtosecond pump-probe spectroscopy
复制标题
DOI：
10.1063/1.2943649
复制
发表时间：
2008-06
影响因子：
4
通讯作者：
A. Ueda;K. Matsuda;T. Tayagaki;Y. Kanemitsu
中科院分区：
文献类型：
--
作者：
A. Ueda;K. Matsuda;T. Tayagaki;Y. Kanemitsu
碳纳米管具有独特的能带结构和较大的激子结合能，是研究激子多体效应的理想材料之一。我们用泵浦-探测暂态吸收测量方法研究了单壁碳纳米管中激子布居的动力学。瞬时吸收信号的时间分布依赖于激发强度和激发光子能量。在室温下，当激发光子能量超过第三子带激子能量时，我们在碳纳米管中观察到载流子倍增现象。
Carbon nanotubes are one of the excellent materials for studying the many-body effects of excitons because of their unique band structures and large exciton binding energies. We studied exciton population dynamics in single-walled carbon nanotubes using pump-probe transient absorption measurements. The temporal profiles of the transient absorption signals depend on the excitation intensity and excitation photon energy. We observe carrier multiplication in carbon nanotubes at room temperature, when the excitation photon energy exceeds the third subband exciton energy.