Comparative study of ultrafast intersubband electron scattering times at ∼1.55 μm wavelength in GaN/AlGaN heterostructures

被引：126

作者：

Heber, JD ^{[1
]}

Gmachl, C ^{[1
]}

Ng, HM ^{[1
]}

Cho, AY ^{[1
]}

机构：

[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

来源：

APPLIED PHYSICS LETTERS | 2002年 / 81卷 / 07期

关键词：

D O I：

10.1063/1.1500412

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on a comparative study of room temperature intersubband electron scattering lifetimes in GaN/AlGaN single and coupled double multiple quantum well (QW) samples with peak absorption wavelengths ranging from 1.4 to 1.7 mum. Using time-resolved pump-probe spectroscopy electron scattering times as short as similar to160 fs have been measured for a coupled QW sample and less than or similar to300 fs for single QW samples. While no significant dependence on the excitation power has been observed, a decrease of the scattering times with increasing probe wavelength has been measured and may be attributed to monolayer fluctuations in the samples. (C) 2002 American Institute of Physics.

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页码：1237 / 1239

页数：3

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