Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic Tilting of Ferroelectric Domain Walls via Optically Induced
  Electronic Screening   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-bandgap ultrafast
optical pulse changes the tilt angle that 90{\deg} 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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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: math
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph