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Title: Characterizing intra-exciton Coulomb scattering in terahertz excitations

An intense terahertz field is applied to excite semiconductor quantum wells yielding strong non-equilibrium exciton distributions. Even though the relaxation channels involve a complicated quantum kinetics of Coulomb and phonon effects, distinct relaxation signatures of Coulomb scattering are identified within time-resolved photoluminescence by comparing the experiment with a reduced model that contains all relevant microscopic processes. The analysis uncovers a unique time scale for the Coulomb scattering directly from experiments and reveals the influence of phonon relaxation as well as radiative decay.
Authors:
; ;  [1] ;  [2] ; ; ;  [1] ; ; ; ;  [3] ; ;  [4]
  1. Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden (Germany)
  2. (Germany)
  3. Department of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, 35032 Marburg (Germany)
  4. Institute for Solid State Electronics and Center for Micro- and Nanostructures, Vienna University of Technology, Floragasse 7, 1040 Vienna (Austria)
Publication Date:
OSTI Identifier:
22391992
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COULOMB SCATTERING; EQUILIBRIUM; EXCITATION; PHONONS; PHOTOLUMINESCENCE; QUANTUM WELLS; RADIATIVE DECAY; RELAXATION; SEMICONDUCTOR MATERIALS; THZ RANGE; TIME RESOLUTION