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

J. D. Heber, Claire F. Gmachl, H. M. Ng, A. Y. Cho

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Abstract

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 μm. Using time-resolved pump-probe spectroscopy electron scattering times as short as ∼160fs have been measured for a coupled QW sample and ≲300fs 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.

Original languageEnglish (US)
Pages (from-to)1237-1239
Number of pages3
JournalApplied Physics Letters
Volume81
Issue number7
DOIs
StatePublished - Aug 12 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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