Dynamics of exciton formation and relaxation in GaAs quantum wells

T. C. Damen, Jagdeep Shah, D. Y. Oberli, D. S. Chemla, J. E. Cunningham, and J. M. Kuo
Phys. Rev. B 42, 7434 – Published 15 October 1990
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Abstract

We show that excitons form with a time constant τ≤20 ps following the creation of electron-hole pairs by subpicosecond optical excitation. The excitons are initially formed in large-wave-vector states. At low temperatures, these nonthermal excitons relax in ≊400 ps to the K≊0 states, which couple directly to light by interaction with other excitons and acoustic phonons. This leads to a slow rise of exciton luminescence and an unusual dependence of this rise time on temperature, excitation density, and excitation energy.

  • Received 30 April 1990

DOI:https://doi.org/10.1103/PhysRevB.42.7434

©1990 American Physical Society

Authors & Affiliations

T. C. Damen, Jagdeep Shah, D. Y. Oberli, D. S. Chemla, J. E. Cunningham, and J. M. Kuo

  • AT&T Bell Laboratories, Holmdel, New Jersey 07733

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Vol. 42, Iss. 12 — 15 October 1990

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