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Ultrafast Photovoltaic Response in Ferroelectric Nanolayers

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; Qi, Tingting; Grinberg, Ilya; Fritz, David M.; Cammarata, Marco; Zhu, Diling; Lemke, Henrik T.; Walko, Donald A.; Dufresne, Eric M.; Li, Yuelin; Larsson, Jo¨rgen; Reis, David A.; Sokolowski-Tinten, Klaus; Nelson, Keith Adam; Rappe, Andrew M.; Fuoss, Paul H.; Stephenson, G. Brian; Lindenberg, Aaron M.; ... Show more Show less
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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.
Date issued
2012-02
URI
http://hdl.handle.net/1721.1/71560
Department
Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. School of Science
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
ISSN
0031-9007
1079-7114

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