Topology of the polarization field in ferroelectric nanowires from first principles

Details Topology of the polarization field in ferroelectric nanowires from first principles Topology of the polarization field in ferroelectric nanowires from first principles

2009-08-25

arxiv.org/abs/0908.3617v1

Phys. Rev. B 81, 172101 (2010)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.81.172101

The behaviour of the cross-sectional polarization field is explored for thin nanowires of barium titanate from first-principles calculations. Topological defects of different winding numbers have been obtained, beyond the known textures in ferroelectric nanostructures. They result from the inward accommodation of the polarization patterns imposed at the surface of the wire by surface and edge effects. Close to a topological defect the polarization field orients out of the basal plane in some cases, maintaining a close to constant magnitude, whereas it virtually vanishes in other cases.

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