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Journal of Materials Science

, Volume 47, Issue 21, pp 7580–7586 | Cite as

Dielectric permittivity of ultrathin PbTiO3 nanowires from first principles

  • G. Pilania
  • R. RamprasadEmail author
First Principles Computations

Abstract

We propose an efficient method to compute the dielectric permittivity of nanostructures by combining first principles density functional perturbation theory with effective medium theory. Specifically, ultrathin axially symmetric ferroelectric PbTiO3 nanowires are considered. As established previously by Pilania and Ramprasad (Phys Rev B 82:155442, 2010), (4 × 4) PbO-terminated nanowire and (4 × 4) TiO2-terminated nanowire display, respectively, a uniform axial and a vortex polarization in their ground state configurations (the latter with a non-zero axial toroidal moment). Both nanowires, regardless of the lateral surface termination, display a significantly larger dielectric constant value along the axial direction, and diminished values along the off-axis directions, as compared to the corresponding bulk values. Our results further suggest that the nanowires with unconventional vortex-type polarization states are expected to have an increased dielectric response as compared to those with conventional uniform axial polarization. The method proposed here is quite general and readily extendable to other zero-, one-, and two-dimensional nanostructures.

Keywords

Dielectric Constant Dielectric Permittivity Dielectric Response Vortex Polarization Effective Medium Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors would like to acknowledge financial support of this study by a grant from the Office of Naval Research. Computational support was provided through a National Science Foundation Teragrid Resource Allocation.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Chemical, Materials, and Biomolecular Engineering, Institute of Materials ScienceUniversity of ConnecticutStorrsUSA

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