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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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
2012-02Department
Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. School of ScienceJournal
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