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

  • Gies S
  • Kruska C
  • Berger C
 et al. 
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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.

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  • S. Gies

  • C. Kruska

  • C. Berger

  • P. Hens

  • C. Fuchs

  • A. Ruiz Perez

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