Abstract
Time- and wavelength-resolved circular dichroism of the excitonic saturation in GaAs-AlxGa1-xAs multiple quantum wells at room temperature is investigated using a degenerate excite-probe method. For moderate excitation, the effects of photogenerated carriers on the heavy-hole exciton resonance are separately identified as the contributions of phase-space filling and Coulombic effects (screening and line-shape broadening). These contributions are observed to be of a similar magnitude. The induced circular dichroism of the exciton saturation was observed to decay with a time constant of 50 ps, which is attributable to electron spin relaxation. © 1994 The American Physical Society.
| Original language | English |
|---|---|
| Pages (from-to) | 17160-17169 |
| Number of pages | 10 |
| Journal | Physical Review B: Condensed Matter and Materials Physics |
| Volume | 49 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 15 Jun 1994 |