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Time-resolved absorption studies of the ZnSe/ZnSTe superlattice

✍ Scribed by H. Wang; I.K. Sou; G.K.L. Wong; K.S. Wong

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 251 KB
Volume: 29
Category: Article
ISSN: 0749-6036
DOI: 10.1006/spmi.2001.0976

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✦ Synopsis

The time-resolved differential absorption of the ZnSe/ZnSTe superlattice is studied using femtosecond pump-probe measurements. Transient spectral hole burning due to the initial nonthermal carrier distribution is observed at zero time delay and the carriers are thermalized within 0.5 ps. The high-energy tail of the differential absorption spectra was used to deduce the effective temperature of the thermalized carriers. Rapid hot-carrier cooling from a temperature of 763 to 450 K within the first 4 ps is observed, with carrier cooling slowing down hence. This initial fast hot-carrier cooling is consistent with the strong carrier-phonon interaction in large gap II-VI semiconductors.

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