Investigation Of Excitonic Saturation By Time-Resolved Circular-Dichroism In Gaas-Alxga1-Xas Multiple-Quantum Wells
Abbreviated Journal Title
Phys. Rev. B
SPIN-RELAXATION; OPTICAL NONLINEARITIES; EXCITED SEMICONDUCTORS; HETEROSTRUCTURES; Physics, Condensed Matter
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.
Physical Review B
"Investigation Of Excitonic Saturation By Time-Resolved Circular-Dichroism In Gaas-Alxga1-Xas Multiple-Quantum Wells" (1994). Faculty Bibliography 1990s. 2974.