Dynamics of excitons and trions in CdTe quantum wells: Direct observation of diffusion and localization

The dynamics of excitons and trions in CdTe modulation-doped quantum wells are studied as a function of temperature by three-pulse four-wave mixing experiments. It is shown that trions are localized by interface roughness scattering and/or by the remote ionized donor potential at low temperature in the low-density regime. The diffusivity of excitons and trions increases with temperature but their mobilities are limited by acoustical phonon scattering, The coherence study reveals that the system is inhomogeneously broadened at low temperature and becomes nearly homogeneous as the temperature is increased.


Published in:
Physica Status Solidi a-Applied Research, 190, 3, 787-791
Year:
2002
ISSN:
0031-8965
Note:
EPFL, Swiss Fed Inst Technol, Inst Micro & Optoelect, Dept Phys, 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, EPFL, Swiss Fed Inst Technol, Inst Micro & Optoelect, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 553CB
Times Cited: 0
Cited Reference Count: 5
Cited References:
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FINKELSTEIN G, 1998, PHYS REV B, V58, P12637
HILLMER H, 1989, PHYS REV B, V39, P10901
KENG K, 1993, PHYS REV LETT, V71, P1752
SALCEDO JR, 1978, PHYS REV LETT, V41, P131
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 Record created 2007-08-31, last modified 2018-03-17


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