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

Report Date:

2016-04-19

Pagination or Media Count:

21.0

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.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE