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  • Daranciang, Dan, et al. (author)
  • Ultrafast Photovoltaic Response in Ferroelectric Nanolayers
  • 2012
  • In: Physical Review Letters. - 1079-7114. ; 108:8
  • Journal article (peer-reviewed)abstract
    • We show that light drives large-amplitude structural changes in thin films of the prototypical ferroelectric PbTiO3 via direct coupling to its intrinsic photovoltaic response. Using time-resolved x-ray scattering to visualize atomic displacements on femtosecond time scales, photoinduced changes in the unit-cell tetragonality are observed. These are driven by the motion of photogenerated free charges within the ferroelectric and can be simply explained by a model including both shift and screening currents, associated with the displacement of electrons first antiparallel to and then parallel to the ferroelectric polarization direction.
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