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Negatively Charged Excitons in CdTe-Based Quantum Wells: A Time-Resolved Study

✍ Scribed by V. Ciulin; P. Kossacki; S. Haacke; J.-D. Ganière; B. Deveaud; A. Esser; M. Kutrowski; T. Wojtowicz

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
148 KB
Volume
227
Category
Article
ISSN
0370-1972

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✦ Synopsis

Using time-resolved photoluminescence, we have investigated the radiative behavior of neutral and negatively charged excitons in CdTe-based quantum wells. We find that the photoluminescence of negatively charged excitons can be well reproduced by a model of delocalized and thermalized three-particle complexes. A large radiative zone in k-space results from the transfer of the charged exciton momentum to the remaining electron (recoil effect). On the other hand, the photoluminescence decay of excitons is not well described in the framework of a model of delocalized and thermalized excitons. We infer that the main difference between the behavior of neutral and charged excitons in the time domain stems from the large radiative zone of charged excitons.

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Formation Time of Negatively Charged Exc
Formation Time of Negatively Charged Excitons in CdTe-Based Quantum Wells
✍ P. Kossacki; V. Ciulin; M. Kutrowski; J.-D. Ganière; T. Wojtowicz; B. Deveaud 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 98 KB 👁 2 views

The formation dynamics of charged excitons is studied in CdTe-based quantum wells by picosecond time-resolved photoluminescence. The formation time is obtained by an analysis of temporal behavior of photoluminescence signal after excitation in resonance with either neutral or charged exciton. It is