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Title: Excitonic transitions in highly efficient (GaIn)As/Ga(AsSb) type-II quantum-well structures

The excitonic transitions of the type-II (GaIn)As/Ga(AsSb) gain medium of a “W”-laser structure are characterized experimentally by modulation spectroscopy and analyzed using microscopic quantum theory. On the basis of the very good agreement between the measured and calculated photoreflectivity, the type-I or type-II character of the observable excitonic transitions is identified. Whereas the energetically lowest three transitions exhibit type-II character, the subsequent energetically higher transitions possess type-I character with much stronger dipole moments. Despite the type-II character, the quantum-well structure exhibits a bright luminescence.
Authors:
; ; ; ; ; ; ; ; ;  [1] ;  [2] ;  [1] ;  [3] ; ;  [4]
  1. Department of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, 35032 Marburg (Germany)
  2. NAsP_I_I_I_/_V GmbH, Am Knechtacker 19, 35041 Marburg (Germany)
  3. (Germany)
  4. College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)
Publication Date:
OSTI Identifier:
22485992
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 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; DIPOLE MOMENTS; GAIN; LASERS; LUMINESCENCE; MODULATION; QUANTUM WELLS; SPECTROSCOPY