| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Coherent Phonon (CP) is one of the representative ultrafast phenomena generated by the irradiation of ultrashort pulse lasers on semiconductors. This study is aimed at understanding the underlying physics of CP in the early time region that has still remained unexplored; this is the time region extended till approximately 100 fs after the irradiation of the pulse laser. The non-perturbative theoretical model with respect to the intensity of irradiated pulse laser is constructed, and is applied to the present physical system to understand the generation mechanism of CP. Further, we obtain the following results as manifestation of a transient Fano effect, irregular oscillatory patterns of CP time signals due to a resonant coupling between plasmon and longitudinal-optical phonon and asymmetric spectral profiles in the associated CP spectra, a Rabi-oscillatory pattern of CP initial phases, and so on. These results are in harmony with experimental ones.
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