Ultrafast relaxation dynamics of photoexcited carriers in metallic and semiconducting single-walled carbon nanotubes
Ultrafast relaxation dynamics of photoexcited carriers in metallic and semiconducting single-walled carbon nanotubes
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DOI：
10.1143/jpsj.73.3479
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发表时间：
2004-12-01
影响因子：
1.7
通讯作者：
Nakamura, A
中科院分区：
文献类型：
--
作者：
Ichida, M;Hamanaka, Y;Nakamura, A
我们利用飞秒泵浦-探测实验研究了金属和半导体单壁碳纳米管中载流子的弛豫动力学。飞秒激发脉冲漂白金属和半导体管的吸收带。在金属管中，吸收光谱的变化从漂白到加宽。光谱特征的弛豫方面从内部热化转变为电子温度冷却。在半导体管中，非辐射通道通过捕获单壁碳纳米管中的缺陷来控制恢复行为。
We have investigated carrier relaxation dynamics in both metallic and semiconducting single-walled carbon nanotubes by means of femtosecond pump-probe experiments. The femtosecond excitation pulse bleaches the absorption bands of both metallic and semiconducting tubes. In the metallic tubes, the change in the absorption spectra vary from bleaching to broadening. The relaxation aspects of the spectral features change from internal thermalization to electron temperature cooling. In the semiconducting tubes, the nonradiative channel governes the recovery behavior via trapping at defects in the SWNTs.