期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 43, 期 2, 页码 237-240出版社
WILEY
DOI: 10.1002/jrs.3028
关键词
Raman scattering; superlattices; folded acoustic phonons
类别
资金
- Spanish Ministry and Innovation [MAT2010-16116]
- CSIC (PIE)
- Institute of Space Systems on Operations (ISSO, UH)
We use Raman scattering to investigate the folded longitudinal acoustic (LA) phonons in a series of InxGa1-xN/GaN superlattices (SLs) grown by molecular beam epitaxy with different compositions (15% < x < 38%) and SL periods (from 8 to 20 nm). A novel, ultralow wavenumber filtering module, which provides access to ultralow wavenumber Raman modes on single-grating spectrometers, has been used to perform the Raman measurements. Zone-folding effects are observed, and the wavenumber behavior of the folded LA modes is well reproduced with a linear dispersion for the folded LA modes as predicted by elastic continuum theory. We employ the wavenumber of the doublets to evaluate the period of the SLs. Copyright (C) 2011 John Wiley & Sons, Ltd.
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