title: Ultrafast photovoltaic response in ferroelectric nanolayers.
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.
authors.affiliation: Department of Chemistry, Stanford University, Stanford, California 94305, USA.
authors.forename: Dan
authors.initials: D
authors.lastname: Daranciang
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Highland
authors.forename: Haidan
authors.initials: H
authors.lastname: Wen
authors.forename: Steve M
authors.initials: SM
authors.lastname: Young
authors.forename: Nathaniel C
authors.initials: NC
authors.lastname: Brandt
authors.forename: Harold Y
authors.initials: HY
authors.lastname: Hwang
authors.forename: Michael
authors.initials: M
authors.lastname: Vattilana
authors.forename: Matthieu
authors.initials: M
authors.lastname: Nicoul
authors.forename: Florian
authors.initials: F
authors.lastname: Quirin
authors.forename: John
authors.initials: J
authors.lastname: Goodfellow
authors.forename: Tingting
authors.initials: T
authors.lastname: Qi
authors.forename: Ilya
authors.initials: I
authors.lastname: Grinberg
authors.forename: David M
authors.initials: DM
authors.lastname: Fritz
authors.forename: Marco
authors.initials: M
authors.lastname: Cammarata
authors.forename: Diling
authors.initials: D
authors.lastname: Zhu
authors.forename: Henrik T
authors.initials: HT
authors.lastname: Lemke
authors.forename: Donald A
authors.initials: DA
authors.lastname: Walko
authors.forename: Eric M
authors.initials: EM
authors.lastname: Dufresne
authors.forename: Yuelin
authors.initials: Y
authors.lastname: Li
authors.forename: Jörgen
authors.initials: J
authors.lastname: Larsson
authors.forename: David A
authors.initials: DA
authors.lastname: Reis
authors.forename: Klaus
authors.initials: K
authors.lastname: Sokolowski-Tinten
authors.forename: Keith A
authors.initials: KA
authors.lastname: Nelson
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Rappe
authors.forename: Paul H
authors.initials: PH
authors.lastname: Fuoss
authors.forename: G Brian
authors.initials: GB
authors.lastname: Stephenson
authors.forename: Aaron M
authors.initials: AM
authors.lastname: Lindenberg