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Ultrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate |
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| Authors: | Jianbo Hu Oleg V Misochko Hiroshi Takahashi Hiroaki Koguchi Takayuki Eda Kazutaka G Nakamura |
| Affiliation: | 1.Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan;2.CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan;3.Institute of Fluid Physics, Chinese Academy of Engineering Physics, PO Box 919-102, Mianyang, Sichuan 621900, Peoples Republic of China;4.Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia |
| Abstract: | Femtosecond time-resolved pump–probe experiments were carried out to study ultrafast lattice dynamics of ferroelectric lithium tantalate. Both the fully symmetric (A1 mode) and doubly degenerate (E mode) coherent phonons at the center of the Brillouin zone were excited via impulsive stimulated Raman scattering, as confirmed by the excitation intensity dependence. |
| Keywords: | lithium tantalate ISRS coherent phonon |