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: https://orcid.org/0000-0001-9818-2284, 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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Abstract

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 http://www.sherpa.ac.uk/romeo/issn/0003-6951/ (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
URI:	https://orca.cardiff.ac.uk/id/eprint/25315

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