Ultrafast localized exciton dynamics in ZnxCd1-xSe-ZnSe multiple quantum wells

Authors
Netti, MC Gadaleta, C Del Fatti, N Vallee, F Tommasi, R
Citation
Mc. Netti et al., Ultrafast localized exciton dynamics in ZnxCd1-xSe-ZnSe multiple quantum wells, PHYS REV B, 61(23), 2000, pp. 15637-15640
Citations number
15
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
61
Issue
23
Year of publication
2000
Pages
15637 - 15640
Database
ISI
SICI code
0163-1829(20000615)61:23<15637:ULEDIZ>2.0.ZU;2-E
Abstract
Localized exciton dynamics and its influence on the ultrafast nonlinear exc itonic response are investigated in ZnxCd1-xSe-ZnSe multiple quantum wells by means of a two-color femtosecond absorption-saturation technique. A dela yed rise of the induced transmission around the heavy- and light-hole excit on lines is observed when localized excitons are photoexcited, yielding evi dence for exciton detrapping on a few picosecond time scale. Pump photon en ergy-dependent measurements show that the photoinjected cold excitons migra te toward higher-energy states at a rate of about 11 meV/ps.