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Excitonic magnetic polaron dynamics of MBE grown CdTe/Cd1 − xMnxTe, Cd1 − xMnxTe/Cd1 − vMgyTe single quantum wells in magneti fields

✍ Scribed by M.C. Debnath; I. Souma; E. Shirado; T. Sato; J. Shen; Y. Oka

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
80 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

Excitonic lifetimes in Cd 1-x Mn x Te, Cd 1-x Mg x Te epilayers and CdTe/Cd 1-x Mn x Te, Cd 1-x Mn x Te/Cd 1-y Mg y Te single quantum wells with different well widths and Mn, Mg compositions are investigated. The excitonic lifetimes are found to reduce drastically by applying external magnetic fields to samples with giant Zeeman splittings. The observed phenomenon is interpreted in terms of the PL decay time contribution from the long-life dark excitons which can convert to excitons for recombinations by a spin-flip process. We attribute the lifetime reduction to the depletion of dark excitons due to their crossing over the exciton energies for dipole allowed transitions in magnetic fields.

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Temperature dependent dynamic of exciton
Temperature dependent dynamic of excitons in Zn1 − xCdxSe/ZnSe multiple quantum wells
✍ D. Greco; L. Calcagnile; R. Cingolani; M. Lomascolo; M. Di Dio; L. Vanzetti; L. 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 59 KB

The exciton dynamics in Zn 1-x Cd x Se/ZnSe multiple quantum wells have been investigated by temperature-dependent time-resolved photoluminescence experiments. A polariton effect (leading to a linear T -dependence of the decay time τ PL ) and thermal escape of carriers from the quantum well at relat