| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
We developed the algorithm to calculate phonon dispersion relations and displacement fields of the wire-type phononic crystals composed of III-V semiconductors. By using this algorithm, phonon dispersion relations corresponding to each mode can be separately calculated, depending on the symmetry of the cross-section and constituent materials. We theoretically examined the coherent guided acoustic phonons generated and observed in a GaN/AlN nanowire superlattice with the use of ultrafast pump-probe spectroscopy. The propagation processes of the observed acoustic phonons are reexamined based on our numerical results. In addition, we studied the dispersion relations for hollow GaN nanowires, and discussed the effect of the hollow structure on the eigenfrequencies of each mode.
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