Abstract

The relaxation of excitons has been investigated in high purity AlxGa1−xAs (x up to 5%) films. After a pulsed excitation at low lattice temperatures (5 K), the time for the excitonic photoluminescence to reach its maximum shows a non‐monotonic dependence on excitation density. The competition between localization of excitons and carrier‐carrier scattering is the origin of this behavior. The spin dynamics have also been investigated, showing a spin lifetime one order of magnitude longer than in quantum wells and a weak dependence on excitation density. The increase of the Al content of the alloy accelerates the dynamics.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call