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

doi:10.1063/1.1500412

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 language	English (US)
Pages (from-to)	1237-1239
Number of pages	3
Journal	Applied Physics Letters
Volume	81
Issue number	7
DOIs	https://doi.org/10.1063/1.1500412
State	Published - Aug 12 2002

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1500412

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

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.",

author = "Heber, {J. D.} and Gmachl, {Claire F.} and Ng, {H. M.} and Cho, {A. Y.}",

year = "2002",

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doi = "10.1063/1.1500412",

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journal = "Applied Physics Letters",

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T1 - Comparative study of ultrafast intersubband electron scattering times at ∼1.55μm wavelength in GaN/AlGaN heterostructures

AU - Heber, J. D.

AU - Gmachl, Claire F.

AU - Ng, H. M.

AU - Cho, A. Y.

PY - 2002/8/12

Y1 - 2002/8/12

N2 - 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.

AB - 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.

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EP - 1239

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 7

ER -

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

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