Diffusion, localization, and dephasing of trions and excitons in CdTe quantum wells

Excitons and trions in a CdTe modulation-doped quantum well are investigated by picosecond three-pulse four-wave mixing experiments as a function of temperature in the low-density regime. We show that trions are mobile for high enough temperatures. The diffusivity of trions and excitons increases with temperature but, like their mobilities, is limited by acoustic-phonon scattering. Consistently, studying the decay of the interband coherence reveals an increase of the homogeneous broadening as the temperature is raised. At low temperatures, excitonic complexes are localized by both interface roughness scattering and by the electrostatic potential due to remote ionized donors.


Published in:
Physical Review B, 66, 15, 155305
Year:
2002
ISSN:
1098-0121
Keywords:
Note:
Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Inst Quantum Elect & Photon, CH-1015 Lausanne, Switzerland. Univ Lausanne, Inst Phys Matiere Condensee, Fac Sci, BSP, CH-1015 Lausanne, Switzerland. Warsaw Univ, Inst Phys Expt, PL-00681 Warsaw, Poland. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. Portella-Oberli, MT, Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, Inst Quantum Elect & Photon, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 612MV
Times Cited: 4
Cited Reference Count: 27
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