Forbidden Resonant Raman Scattering in GaAs/AlAs Superlattices: Experiment and Calculations
- Авторы: Volodin V.1,2, Sachkov V.3, Sinyukov M.1
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Учреждения:
- Rzhanov Institute of Semiconductor Physics, Siberian Branch
- Novosibirsk State University
- Omsk Scientific Center, Siberian Branch
- Выпуск: Том 52, № 6 (2018)
- Страницы: 717-722
- Раздел: Spectroscopy, Interaction with Radiation
- URL: https://journals.rcsi.science/1063-7826/article/view/203462
- DOI: https://doi.org/10.1134/S1063782618060234
- ID: 203462
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Аннотация
The Raman spectra of GaAs/AlAs(100) superlattices are calculated and studied experimentally for various wave-vector directions. The experiments are performed when applying a confocal optical microscope combined with a micro-Raman spectrometer for various scattering geometries both for phonons with a wave vector directed along the normal to a superlattice and in the in-plane geometry. The frequencies and eigenvectors of phonons are calculated in the extended Born model approximation taking into account Coulomb interaction in the rigid-ion approximation. The Raman spectra are calculated in the scope of the deformation- potential mechanism; herewith, it turns out that additional peaks, which are not described in the scope of this approach, appear in the experimental spectra. It seems likely that these peaks appear due to the manifestation of Raman scattering forbidden by selection rules under resonance conditions. An attempt is made to explain the appearance of these peaks in the experimental spectra within the scope of inelastic phonon scattering at bound charges (phonons with a large dipole moment).
Об авторах
V. Volodin
Rzhanov Institute of Semiconductor Physics, Siberian Branch; Novosibirsk State University
Автор, ответственный за переписку.
Email: volodin@isp.nsc.ru
Россия, Novosibirsk, 630090; Novosibirsk, 630090
V. Sachkov
Omsk Scientific Center, Siberian Branch
Email: volodin@isp.nsc.ru
Россия, Omsk, 644024
M. Sinyukov
Rzhanov Institute of Semiconductor Physics, Siberian Branch
Email: volodin@isp.nsc.ru
Россия, Novosibirsk, 630090