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Intervalence-band photoinduced absorption in undoped GaAs/AlxGa1−xAs multiple-quantum-wells

✍ Scribed by M. Olszakier; I. Brener; E. Ehrenfreund; E. Cohen

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 262 KB
Volume: 7
Category: Article
ISSN: 0749-6036
DOI: 10.1016/0749-6036(90)90212-p

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✦ Synopsis

We report the results of photoinduced absorption (PA) measurements in the energy range appropriate for transitions between the heavy holes (hh) and the spin orbit split-off valence-band holes (ao), in samples of undoped, bulk GaAa and GaAa/AlGaAa multiple-quantum-wells (MQW). The bulk GaAa hh-so absorption band is broad and asymmetric; its line shape is accounted for by a finite k-space width of the hole Bloch states, arising, for instance, from impurity scattering.

A good fit to the data was obtained using a ctasonable width of Ak N O.O25A-'. In the MQW structures, the intervalence band hhl-sol PA is identified. In addition, impurity related ao transitions were also observed.

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