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Intersubband lifetimes in p-Si/SiGe terahertz quantum cascade heterostructures

Kelsall, R., Ikonic, Z., Murzyn, P., Pidgeon, C., Phillips, P., Carder, D., Harrison, P., Lynch, Stephen Anthony ORCID:, Townsend, P., Paul, D., Liew, S., Norris, D. and Cullis, A. 2005. Intersubband lifetimes in p-Si/SiGe terahertz quantum cascade heterostructures. Physical Review B: Condensed Matter and Materials Physics 71 (11) , 115326. 10.1103/PhysRevB.71.115326

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Time-resolved studies of the dynamics of intersubband transitions are reported in three different strain symmetrized p-Si∕SiGe multiple-quantum-well and quantum cascade structures in the far-infrared wavelength range (where the photon energy is less than the optical phonon energy), utilizing the FELIX free-electron laser. The calculated rates for optical and acoustic phonon scattering, alloy disorder scattering, and carrier-carrier scattering have been included in a self-consistent energy balance model of the transient far-infrared intersubband absorption, and show good agreement with our degenerate pump-probe spectroscopy measurements in which, after an initial rise time determined by the resolution of our measurement, we determine decay times ranging from ∼2 to ∼25 ps depending on the design of the structure. In all three samples the lifetimes for the transition from the first light hole subband to the first heavy hole subband are found to be approximately constant in the temperature range 4–100 K.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: 10 pp.
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 19 Oct 2022 10:43

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