Dynamics of Excitons in Quantum Wells,
IBM THOMAS J WATSON RESEARCH CENTER YORKTOWN HEIGHTS NY
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We measure the time dependence of the excitonic photoluminescence PL in quantum wells QWs with well width Lz ranging from 25A to 50A. The samples are AI0.2Ga0.8AsGaAs multiple QWs with 30 periods with decoupled wells and were grown by molecular beam epitaxy MBE. QWs grown with and without growth interruption at the interfaces are investigated. The excitation is provided by 5 psec pulses from a synchronously pumped tunable dye laser. The PL spectrum is detected by an imaging i.e. multichannel photomultiplier with a spectral resolution of 0.5 meV and time resolution FWHM of 120 psec.
- Electrooptical and Optoelectronic Devices