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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper QThD4

Intersubband scattering and thermalization of electrons in GalnAs/AllnAs quantum wells studied by femtosecond infrared spectroscopy

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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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