Abstract
We have investigated the intraband carrier relaxation and exciton formation dynamics in a Zn0.88Cd0.12Se/ZnS0.12Se0.88 multiple quantum well using a femtosecond pump and probe method. We have analyzed the spectral shape of the exciton absorption band, and obtained the temporal change of the homogeneous broadening. The homogeneous width of the heavy-hole exciton absorption shows the delayed rise of ∼1 ps and the two-component decay with decay times of ∼10 ps and ∼100 ps. These behaviors are dependent on temperature and pumping wavelength. The temporal behavior of the additional broadening has been explained by the numerical simulation, taking into account the intraband carrier relaxation and the exciton formation.
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