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First-principles study of the electro-optic effect in ferroelectric oxides
Marek Veithen1, Xavier Gonze, Philippe Ghosez
1Département de Physique, Université de Liège, B-5, B-4000 Sart-Tilman, Belgium.
Physical Review Letters
|November 5, 2004
Summary
We developed a method to calculate the electro-optic tensor, revealing the soft mode
Area of Science:
- Condensed matter physics
- Materials science
- Computational materials science
Background:
- Ferroelectric materials exhibit significant electro-optic effects.
- Understanding these effects is crucial for optical device applications.
- First-principles calculations offer a powerful tool for materials discovery.
Purpose of the Study:
- To present a novel method for computing the electro-optic tensor.
- To investigate the nonlinear optic behavior of ferroelectric oxides.
- To elucidate the microscopic origins of electro-optic responses.
Main Methods:
- First-principles calculations incorporating electronic, ionic, and piezoelectric contributions.
- Analysis of the soft mode's role in electro-optic coefficients.
- Study of three paradigmatic ferroelectric oxides: LiNbO3, BaTiO3, and PbTiO3.
Main Results:
- The soft mode significantly contributes to electro-optic coefficients in LiNbO3 and BaTiO3.
- The soft mode plays a minor role in PbTiO3's electro-optic response.
- Coupling between electric fields and polar atomic displacements in B-O chains drives the electro-optic response in perovskite ABO3 compounds.
Conclusions:
- The developed method accurately computes electro-optic tensors.
- Microscopic mechanisms behind electro-optic effects in ferroelectrics are identified.
- Insights pave the way for designing novel electro-optic materials.