Abstract
The ultrafast dynamics of carriers in lowdimensional semiconductora is governed by inter- and intrasubband scattering processes resulting from carrier-carrier and carrier-phonon interactions.1 In this paper, we report femtosecond studies of electron dynamics occurring after optical excitation to a higher conduction sub-band in GalnAs/AllnAs quantum wells. Our results demonstrate a lifetime of the n = 2 conduction subband of 1 ps and give the first direct insight into the relatively slow electron thermalization after intersubband excitation.
© 1996 Optical Society of America
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