Trions and excitons in CdTe quantum wells: Lifetimes, coherence, diffusion and localization

We present the results of a study of the dynamics of trions and excitons in a CdTe modulationdoped quantum well as a function of temperature in the low-density regime. Using three-pulse four-wave mixing technique, we show that, at low temperature, these quasi-particles are inhomo-geneously broadened and localized due to disorder effects. At higher temperatures, trions and excitons are mobile and their homogeneous broadening is largely increased as a result of acoustic phonon scattering. Consistently, time-resolved luminescence measurements also reveal a free-particle character for trions at high temperatures.


Published in:
Physica Status Solidi B-Basic Research, 234, 1, 294-303
Year:
2002
ISSN:
0370-1972
Keywords:
Note:
Swiss Fed Inst Technol, Inst Quantum Elect & Photon, EPFL, CH-1015 Lausanne, Switzerland. Univ Lausanne, Inst Phys Mat Condensee, Fac Sci, BSP, CH-1015 Lausanne, Switzerland. Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. Portella-Oberli, MT, Swiss Fed Inst Technol, Inst Quantum Elect & Photon, EPFL, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 621QL
Times Cited: 0
Cited Reference Count: 25
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