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

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • MT Portella-Oberli, Swiss Federal Institute of Technology
  • ,
  • Ciulin
  • S Haacke, University of Lausanne
  • ,
  • JD Ganiere, Swiss Federal Institute of Technology
  • ,
  • P Kossacki, University of Warzaw
  • ,
  • M Kutrowski, Polish Academy of Science
  • ,
  • T Wojtowicz, Polish Academy of Science
  • ,
  • B Deveaud, Swiss Federal Institute of Technology

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.

Original languageEnglish
Article number155305
JournalPhysical Review B
Volume66
Issue15
Pages (from-to)155305, 1-5
Number of pages5
ISSN1098-0121
DOIs
Publication statusPublished - 2002
Externally publishedYes

    Research areas

  • NEGATIVELY CHARGED EXCITONS, ELECTRON-GAS, MOBILITY, SPECTROSCOPY, TRANSPORT

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