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Picosecond intersubband dynamics in p-Si/SiGe quantum-well emitter structures

Murzyn, P., Pidgeon, C. R., Wells, J.-P. R., Bradley, I. V., Ikonic, Z., Kelsall, R. W., Harrison, P., Lynch, Stephen Anthony ORCID:, Paul, D. J., Arnone, D. D., Robbins, D. J., Norris, D. and Cullis, A. G. 2002. Picosecond intersubband dynamics in p-Si/SiGe quantum-well emitter structures. Applied Physics Letters 80 (8) , 1456. 10.1063/1.1452794

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We report time-resolved (ps) studies of the dynamics of intersubband transitions in p-Si/SiGe multiquantum-well structures in the far-infrared (FIR) regime, ℏω<ℏωLO, utilizing the Dutch free electron laser, (entitled FELIX—free electron laser for infrared radiation). The calculated scattering rates for optic and acoustic phonon, and alloy scattering have been included in a rate equation model of the transient FIR intersubband absorption, and show excellent agreement with our degenerate pump-probe spectroscopy measurements where, after an initial rise time determined by the resolution of our measurement, we determine a decay time of ∼10 ps. This is found to be approximately constant in the temperature range from 4 to 100 K, in good agreement with the predictions of alloy scattering in the Si0.7Ge0.3 wells.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: 3 Page Article. Pdf uploaded in accordance with publisher's policy at (accessed 21/02/2014).
Publisher: American Institute of Physics
ISSN: 0003-6951
Date of First Compliant Deposit: 30 March 2016
Last Modified: 08 May 2023 22:57

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