Abstract
Excitons in III–V quantum wells (QWs) are strongly coupled to polar longitudinal optical (LO) phonons. The binding energies of the quasi 2-D excitons (Eb ≈ 1-10 meV) are smaller than the energies of the LO phonons (ħΩLO ≈ 30-40 meV). Excitons are thus unstable against LO-phonon collisions which can ionize them and release a free electron hole pair with substantial excess energy. It is clear that this process is temperature dependent. At high temperature the collision rate increases and the excitonic lifetime is reduced significantly.
© 1989 Optical Society of America
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