Pump and probe measurement of intersubband relaxation time in short-wavelength intersubband transition

被引：16

作者：

Asano, T ^{[1
]}

Noda, S ^{[1
]}

Tomoda, K ^{[1
]}

机构：

[1] Kyoto Univ, Dept Elect Sci & Engn, Kyoto 60601, Japan

来源：

APPLIED PHYSICS LETTERS | 1999年 / 74卷 / 10期

关键词：

D O I：

10.1063/1.123568

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Population relaxation dynamics of the short-wavelength (2.5 mu m) intersubband transition (ISB-T) in narrow InGaAs/AlAs quantum wells is investigated. Femtosecond (similar to 100 fs) pump and probe measurement yields a relaxation time of similar to 2.7 ps, which is as fast as those observed for 10-5 mu m ISB-T (0.7-1.5 ps, respectively). The ISB relaxation time increases more rapidly than that predicted from the usual intersubband optical-phonon scattering model as the ISB-T energy increases. Our theoretical calculation, which takes into account the intrasubband energy relaxation process, agrees well with the experimental results. The intrasubband energy relaxation process is found to be important in the short-wavelength region. (C) 1999 American Institute of Physics. [S0003-6951(99)02110-5].

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页码：1418 / 1420

页数：3

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