Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3056653
Keywords
gallium compounds; high-speed optical techniques; III-V semiconductors; indium compounds; piezoelectric semiconductors; semiconductor superlattices; vibrational modes; wide band gap semiconductors
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Funding
- EPSRC [EP/E035167/1, EP/H019324/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H019324/1, EP/E035167/1] Funding Source: researchfish
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The femtosecond optical pump-probe technique is used to generate and detect the coherent acoustic vibrations with a frequency 0.83x10(12) Hz in polar (0001) and semipolar (1122) InGaN/GaN superlattices. The measured amplitude of the vibrations in the semipolar sample is about five times smaller that in the polar one. Analysis of the experimental data and theoretical estimates suggest that, in addition to piezoelectric, deformation potential provides essential contribution to both generation and detection of vibrations, especially in the semipolar superlattice.
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