Comparison of optical nonlinearities of type II and type I quantum wells
作者:
K. Meissner,
B. Fluegel,
R. Binder,
S. W. Koch,
G. Khitrova,
N. Peygambarian,
期刊:
Applied Physics Letters
(AIP Available online 1991)
卷期:
Volume 59,
issue 3
页码: 259-261
ISSN:0003-6951
年代: 1991
DOI:10.1063/1.105614
出版商: AIP
数据来源: AIP
摘要:
We have performed low‐temperature femtosecond pump and probe experiments on GaAs/AlAs type II and GaAs/AlGaAs type I multiple quantum wells of similar well sizes. The measurements are analyzed using a many‐body theory appropriate for both types of systems. It is found that the type I and type II nonlinearities are very similar at early times after excitation. However, the very fast (<1 ps) &Ggr; toXelectron scattering in the type II samples causes pronounced differences at later times, allowing the observation of hole relaxation in the type II samples.
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