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Optical and electrical investigation of the population properties for quantum cascade structures

✍ Scribed by L Schrottke; R Hey; H.-Y Hao; T Ohtsuka; H.T Grahn

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 173 KB
Volume: 13
Category: Article
ISSN: 1386-9477
DOI: 10.1016/s1386-9477(02)00222-9

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✦ Synopsis

We have investigated the electric-ÿeld-dependent subband population and carrier dynamics in double-quantum-well superlattices (DQW-SLs) as well as quantum cascade structures (QCSs) of the GaAs=(Al,Ga)As material system by (interband) photoluminescence spectroscopy and current-voltage characteristics. In several DQW-SLs, absolute values for the subband population of electrons and the transfer coe cients of holes have been determined. In typical QCSs, the characteristic times for the hole relaxation into the widest well have been estimated to be of the order of several picoseconds. Although the characteristic times become very short, the electric-ÿeld-dependent population of the ground states in the active region can be qualitatively characterized.

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