Accession Number : AD1007479


Title :   Ultrafast Photovoltaic Response in Ferroelectric Nanolayers


Descriptive Note : Journal Article


Corporate Author : SLAC NATIONAL ACCELERATOR LAB MENLO PARK CA MENLO PARK United States


Personal Author(s) : Daranciang,Dan ; Highland,Matthew J ; Wen,Haidan ; Young,Steven M ; Brandt,Nathaniel C ; Hwang,Harold Y ; Vattilana,Michael ; Nicoul,Matthieu ; Quirin,Florian ; Goodfellow,John ; Qi,Tingting ; Grinberg,Ilya ; Fritz,David M ; Cammarata,Marco ; Zhu,Diling ; Lemke,Henrik T ; Walko,David M ; Dufresne,Eric M ; Li,Yuelin ; Larsson,Jorgen ; Reis,David A ; Sokolowski-Tinten,Klaus ; Nelson,Keith A ; Rappe,Andrew M ; Fuoss,Paul H ; Stephenson,G Brian ; Lindenberg,Aaron M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1007479.pdf


Report Date : 19 Apr 2016


Pagination or Media Count : 21


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 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.


Descriptors :   PHOTOVOLTAIC EFFECT , Ferroelectric materials , COUPLINGS , Electrons , Polarization , X ray scattering , thin films


Distribution Statement : APPROVED FOR PUBLIC RELEASE