Ultrafast carrier dynamics and coherent acoustic phonons in bulk CdSe.

@article{Wu2015UltrafastCD,
  title={Ultrafast carrier dynamics and coherent acoustic phonons in bulk CdSe.},
  author={Weiwei Wu and Yaguo Wang},
  journal={Optics letters},
  year={2015},
  volume={40 1},
  pages={64-7}
}
The femtosecond pump-probe technique is used to study the dynamics of photoexcited carriers and coherent acoustic phonons in bulk CdSe semiconductor. A turning point from fast to slow decay is observed, whose amplitude decreases with pump fluences and eventually flips the sign of differential reflectivity. The maximum change of differential reflectivity shows a saturation at high pump fluences, which is attributed to the optical energy gap dependent on carrier density. Long-lasting coherent… CONTINUE READING