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

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4935212· OSTI ID:22485992

Gies, S.; Kruska, C.; Berger, C.; Hens, P.; Fuchs, C.; Rosemann, N. W.; Veletas, J.; Stolz, W.; Koch, S. W.; Ruiz Perez, A. ^[1]; Chatterjee, S. ^[2]; Hader, J.; Moloney, J. V. ^[3]

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1. NAsP_I_I_I_/_V GmbH, Am Knechtacker 19, 35041 Marburg (Germany)
2. Department of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5, 35032 Marburg (Germany)
3. College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)

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.

• OSTI ID: 22485992
• Journal Information: Applied Physics Letters, Vol. 107, Issue 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DIPOLE MOMENTS
GAIN
LASERS
LUMINESCENCE
MODULATION
QUANTUM WELLS
SPECTROSCOPY