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

M. T. Portella-Oberli, V. Ciulin, S. Haacke, J.-D. Ganière, P. Kossacki, M. Kutrowski, T. Wojtowicz, and B. Deveaud
Phys. Rev. B 66, 155305 – Published 3 October 2002
PDFExport Citation

Abstract

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.

  • Received 2 January 2002

DOI:https://doi.org/10.1103/PhysRevB.66.155305

©2002 American Physical Society

Authors & Affiliations

M. T. Portella-Oberli1, V. Ciulin1, S. Haacke2, J.-D. Ganière1, P. Kossacki3, M. Kutrowski4, T. Wojtowicz4, and B. Deveaud1

  • 1Institute of Quantum Electronics and Photonics, Swiss Federal Institute of Technology, CH1015 Lausanne EPFL, Switzerland
  • 2Institut de Physique de la Matière Condensée, Faculté des Sciences, BSP, University of Lausanne, CH1015 Lausanne-Dorigny, Switzerland
  • 3Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland
  • 4Institute of Physics, Polish Academy of Science, aleja Lotnikow 32/46, 02-668, Warsaw, Poland

References (Subscription Required)

Click to Expand
Issue

Vol. 66, Iss. 15 — 15 October 2002

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×