title: Ultrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate.
abstract: Femtosecond time-resolved pump-probe experiments were carried out to study ultrafast lattice dynamics of ferroelectric lithium tantalate. Both the fully symmetric (A1mode) 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.
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan; Institute of Fluid Physics, Chinese Academy of Engineering Physics, PO Box 919-102, Mianyang, Sichuan 621900, Peoples Republic of China.
authors.forename: Jianbo
authors.initials: J
authors.lastname: Hu
authors.affiliation: Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia.
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Misochko
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takahashi
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Koguchi
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Eda
authors.affiliation: Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Kazutaka G
authors.initials: KG
authors.lastname: Nakamura
keywords: ISRS; coherent phonon; lithium tantalate