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Photostriction in Ferroelectrics from Density Functional Theory.

Charles Paillard1,2, Bin Xu2,3, Brahim Dkhil1

  • 1Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupélec, CNRS UMR8580, Université Paris-Saclay, 92290 Châtenay-Malabry, France.

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Summary
This summary is machine-generated.

A new computational method predicts photostriction in ferroelectric materials by simulating light-induced electron changes. This technique reveals how photoexcited electrons and material structure influence deformation, offering insights into multiferroic BiFeO3 behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Materials Science

Background:

  • Ferroelectric materials exhibit spontaneous electric polarization, which can be manipulated by external stimuli.
  • Understanding light-induced deformation (photostriction) is crucial for optoelectronic applications.
  • Previous methods lacked precise simulation of photoexcitation effects on material structure.

Purpose of the Study:

  • To develop an ab initio computational procedure for calculating ferroelectric material deformation under light.
  • To investigate the photostriction effect in multiferroic Bismuth Ferrite (BiFeO3).
  • To elucidate the underlying mechanisms of photostriction in these materials.

Main Methods:

  • Utilized a constrained density functional theory (DFT) method.
  • Simulated structural relaxation under fixed photoexcited electron concentration (n_e).
  • Calculated changes in lattice constants along specific crystallographic directions.

Main Results:

  • The method accurately predicts photostriction in bulk BiFeO3, comparable to experimental observations.
  • Photostrictive response shows significant dependence on the specific electronic state reached by photoexcited electrons.
  • The crystallographic direction chosen for analysis strongly influences the calculated photostriction magnitude.

Conclusions:

  • The developed computational approach provides a reliable tool for studying photostriction in ferroelectrics.
  • Photoexcited electrons screen spontaneous polarization, and the inverse piezoelectric effect drives the photostriction mechanism.
  • This work offers a deeper understanding of light-matter interactions in multiferroic materials.