| Literature DB >> 22463572 |
Dan Daranciang1, Matthew J Highland, Haidan Wen, Steve M Young, Nathaniel C Brandt, Harold Y Hwang, Michael Vattilana, Matthieu Nicoul, Florian Quirin, John Goodfellow, Tingting Qi, Ilya Grinberg, David M Fritz, Marco Cammarata, Diling Zhu, Henrik T Lemke, Donald A Walko, Eric M Dufresne, Yuelin Li, Jörgen Larsson, David A Reis, Klaus Sokolowski-Tinten, Keith A Nelson, Andrew M Rappe, Paul H Fuoss, G Brian Stephenson, Aaron M Lindenberg.
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.Entities:
Year: 2012 PMID： 22463572 DOI： 10.1103/PhysRevLett.108.087601
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161