Ultrafast Photovoltaic Response in Ferroelectric Nanolayers
Name
Daranciang-2012-Ultrafast Photovoltaic Response in Ferroelectric Nanolayers.pdf
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882.02 KB
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Author(s)
Daranciang, Dan
Highland, Matthew J.
Wen, Haidan
Young, Steve M.
Brandt, Nathaniel Curran
Hwang, Harold Young
Vattilana, Michael
Nicoul, Matthieu
Quirin, Florian
Goodfellow, John
Date Issued
February 2012
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Daranciang, Dan et al. “Ultrafast Photovoltaic Response in Ferroelectric Nanolayers.” Physical Review Letters 108.8 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We show that light drives large-amplitude structural changes in thin films of the prototypical ferroelectric PbTiO[subscript 3] 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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. School of Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.087601
