Quantum beats between trion and exciton transitions in modulation-doped CdTe quantum wells

Authors
Gilliot, P Brinkmann, D Kudrna, J Cregut, O Levy, R Arnoult, A Cibert, J Tatarenko, S
Citation
P. Gilliot et al., Quantum beats between trion and exciton transitions in modulation-doped CdTe quantum wells, PHYS REV B, 60(8), 1999, pp. 5797-5801
Citations number
31
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B-CONDENSED MATTER
ISSN journal
01631829 → ACNP
Volume
60
Issue
8
Year of publication
1999
Pages
5797 - 5801
Database
ISI
SICI code
0163-1829(19990815)60:8<5797:QBBTAE>2.0.ZU;2-Z
Abstract
We investigate the coherence properties of trions (charged excitons) and ne utral excitons in modulation p-doped CdTe/CdMgZnTe quantum wells by means o f femtosecond four-wave-mixing (FWM) experiments. Under simultaneous and co herent excitation of the exciton and trion resonances, we observe a modulat ion of the FWM traces due to quantum beats. This excludes a complete spatia l separation of trions and neutral excitons. A minor contribution from pola rization interferences is explained by the superposition of signals from lo calized trions and free excitons. [S0163-1829(99)05731-8].