4.8 Article

Dynamic Tilting of Ferroelectric Domain Walls Caused by Optically Induced Electronic Screening

Journal

PHYSICAL REVIEW LETTERS
Volume 127, Issue 9, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.097402

Keywords

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Funding

  1. U.S. National Science Foundation [DMR-1609545]
  2. University of Groningen, De Aduarderking (Ubbo Emmius Fonds)
  3. U.S. Department of Energy Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
  4. NSF through the University of Wisconsin Materials Research Science and Engineering Center [DMR-1720415]

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Optical excitation disrupts the balance of phenomena selecting the tilt orientation of domain walls within ferroelectric thin films. Tilting of domain walls occurs at 298 K due to the coexistence of a/b and a/c domain phases, leading to increased domain-wall charge density. This screening mechanism points to new directions for the manipulation of nanoscale ferroelectricity.
Optical excitation perturbs the balance of phenomena selecting the tilt orientation of domain walls within ferroelectric thin films. The high carrier density induced in a low-strain BaTiO3 thin film by an above-band-gap ultrafast optical pulse changes the tilt angle that 90 degrees a/c domain walls form with respect to the substrate-film interface. The dynamics of the changes are apparent in time-resolved synchrotron x-ray scattering studies of the domain diffuse scattering. Tilting occurs at 298 K, a temperature at which the a/b and a/c domain phases coexist but is absent at 343 K in the better ordered single-phase a/c regime. Phase coexistence at 298 K leads to increased domain-wall charge density, and thus a larger screening effect than in the single-phase regime. The screening mechanism points to new directions for the manipulation of nanoscale ferroelectricity.

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