Ultrafast Photovoltaic Response in Ferroelectric Nanolayers

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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 timescales, 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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Daranciang, Dan February 15, 2012.

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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 timescales, 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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  • Journal Name: Submitted to Physical Review Letters; Journal Volume: 108; Journal Issue: 8

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  • Report No.: SLAC-PUB-14848
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevLett.108.087601 | External Link
  • Office of Scientific & Technical Information Report Number: 1035077
  • Archival Resource Key: ark:/67531/metadc836961

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  • February 15, 2012

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 4:39 p.m.

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Daranciang, Dan. Ultrafast Photovoltaic Response in Ferroelectric Nanolayers, article, February 15, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc836961/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.