Excitonic magnetic polaron dynamics of MBE grown CdTe/Cd1-xMnxTe, Cd1-xMnxTe/Cd1-yMgyTe single quantum wells in magnetic fields

Authors
Debnath, MC Souma, I Shirado, E Sato, T Shen, JX Oka, Y
Citation
Mc. Debnath et al., Excitonic magnetic polaron dynamics of MBE grown CdTe/Cd1-xMnxTe, Cd1-xMnxTe/Cd1-yMgyTe single quantum wells in magnetic fields, SUPERLATT M, 25(1-2), 1999, pp. 383-388
Citations number
5
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SUPERLATTICES AND MICROSTRUCTURES
ISSN journal
07496036 → ACNP
Volume
25
Issue
1-2
Year of publication
1999
Pages
383 - 388
Database
ISI
SICI code
0749-6036(199901/02)25:1-2<383:EMPDOM>2.0.ZU;2-G
Abstract
Excitonic lifetimes in Cd1-xMnxTe, Cd1-xMgxTe epilayers and CdTe/Cd1-xMnxTe , Cd1-xMnxTe/Cd1-yMgyTe 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 gi ant Zeeman splittings. The observed phenomenon is interpreted in terms of t he PL decay time contribution from the long-life dark excitons which can co nvert to excitons for recombinations by a spin-flip process. We attribute t he lifetime reduction to the depletion of dark excitons due to their crossi ng over the exciton energies for dipole allowed transitions in magnetic fie lds. (C) 1999 Academic Press.