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Title: Coexistence of nearly free and strongly bound trions from magneto-photoluminescence of two-dimensional quantum structures with tunable electron or hole concentration

We report on polarization-resolved photoluminescence studies of diverse excitonic complexes formed in GaAs quantum wells with a high-mobility two-dimensional hole gas in magnetic fields up to 23 T. Using two-beam illumination we decrease the hole concentration beyond the point of conversion from p- to n-type structures. We have demonstrated charge conversion between positive and negative exciton complexes (both free and bound to acceptors in the well). The switch between the electron and hole gases allowed us to distinguish between the emission lines from positive trions moving almost freely in the quantum well and bound to ionized acceptors in the barrier, which indicate their coexistence in the same well.
Authors:
; ; ;  [1] ;  [2] ; ; ;  [3] ; ;  [4] ; ; ;  [5]
  1. Institute of Physics, Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw (Poland)
  2. Grenoble High Magnetic Field Laboratory, CNRS, 38-042 Grenoble (France)
  3. Experimentelle Physik 2, Technische Universität Dortmund, D-44227 Dortmund (Germany)
  4. Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätstraße (Germany)
  5. Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE (United Kingdom)
Publication Date:
OSTI Identifier:
22261917
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRONS; GALLIUM ARSENIDES; MAGNETIC FIELDS; PHOTOLUMINESCENCE; POLARIZATION; QUANTUM WELLS