Author/Authors :
C.R Pidgeon، نويسنده , , P Murzyn، نويسنده , , J.-P.R Wells، نويسنده , , I.V Bradley، نويسنده , , Z Ikonic، نويسنده , , R.W Kelsall، نويسنده , , P Harrison، نويسنده , , SA Lynch، نويسنده , , D.J Paul، نويسنده , , D.D Arnone، نويسنده , , D.J Robbins، نويسنده , , D Norris، نويسنده , , A.G. Cullis، نويسنده ,
Abstract :
We report time-resolved (ps) studies of the dynamics of intersubband transitions in p-Si/SiGe multi-quantum well structures in the FIR regime, ℏω<ℏωLO, utilizing the Dutch free electron laser, FELIX. The calculated scattering rates 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 View the MathML source. This is found to be approximately constant in the temperature range from 4 to View the MathML source, in good agreement with the predictions of alloy scattering in the Si0.7Ge0.3 wells.
