skip to main content
Idioma:

Ultrafast terahertz-field-driven ionic response in ferroelectric BaTiO3

Chen, F

Physical review. B, 2016-11, Vol.94 (18) [Periódico revisado por pares]

College Park: American Physical Society

Texto completo disponível

Citações Citado por
  • Título:
    Ultrafast terahertz-field-driven ionic response in ferroelectric BaTiO3
  • Autor: Chen, F
  • Assuntos: Barium titanates ; Electric fields ; Ferroelectric materials ; Ferroelectricity ; First principles ; High temperature effects ; Molecular dynamics ; Polarization ; Structural analysis ; Thin films
  • É parte de: Physical review. B, 2016-11, Vol.94 (18)
  • Descrição: The dynamical processes associated with electric field manipulation of the polarization in a ferroelectric remain largely unknown but fundamentally determine the speed and functionality of ferroelectric materials and devices. Here we apply subpicosecond duration, single-cycle terahertz pulses as an ultrafast electric field bias to prototypical BaTiO3 ferroelectric thin films with the atomic-scale response probed by femtosecond x-ray-scattering techniques. We show that electric fields applied perpendicular to the ferroelectric polarization drive large-amplitude displacements of the titanium atoms along the ferroelectric polarization axis, comparable to that of the built-in displacements associated with the intrinsic polarization and incoherent across unit cells. This effect is associated with a dynamic rotation of the ferroelectric polarization switching on and then off on picosecond time scales. These transient polarization modulations are followed by long-lived vibrational heating effects driven by resonant excitation of the ferroelectric soft mode, as reflected in changes in the c-axis tetragonality. The ultrafast structural characterization described here enables a direct comparison with first-principles-based molecular-dynamics simulations, with good agreement obtained.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  4 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.