Resonant gamma-X-Transfer in GaAs/AlAs Quantum-Well Structures
BAYREUTH UNIV (GERMANY) PHYSIKALISCHESINST
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We investigate the Gamma2-Xz1 intersubband dynamics in GaAsAlAs quantum-well structures by time-resolved infrared pump and probe experiments. In the studied structure, the second Gamma-level in GaAs is nearly resonant to the first Xz--level in AlAs. We observe a biexponential decay of the bleaching signal with a fast time constant in the order of 1 ps and a second slower time constant of about 7 ps at 10 K and 4 ps at 300 K, respectively. The long term decay represents the Xz--Gamma2 transfer by elastic Gamma-X scattering at low temperatures. At 300 K electron-LO-phonon-scattering accelerates the Gamma-X transfer.
- Solid State Physics
- Infrared Detection and Detectors