title: Fermi resonance involving nonlinear dynamical couplings in Pb(Zr,Ti)O3 solid solutions.
abstract: We have used first-principles-based simulations and Raman scattering techniques to reveal a novel dynamical phenomenon in Pb(Zr,Ti)O(3) solid solutions: a Fermi resonance (FR) emerging from the nonlinear coupling between ferroelectric (FE) motions and tiltings of oxygen octahedra. This FR manifests itself as the doubling of a nominally single FE mode in a purely FE phase, when the resonant frequency of the FE mode is close to the first overtone of the tiltings. We show that the FR is the result of a nonlinear coupling that is proportional to the spontaneous polarization of the material and derive an analytical model that captures the essence of the effect.
authors: Shaanxi Key Laboratory of Photonics Technology for Information, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China. dawei.wang@mail.xjtu.edu.cn
authors: Dawei
authors: D
authors: Wang
authors: Elena
authors: E
authors: Buixaderas
authors: Jorge
authors: J
authors: Íñiguez
authors: Jeevaka
authors: J
authors: Weerasinghe
authors: Hong
authors: H
authors: Wang
authors: L
authors: L
authors: Bellaiche