AI Article Synopsis
- The study focuses on how light interacts with materials, emphasizing the potential for rapid adjustments in material properties using radiation energy.
- It explores the structural changes in the photoferroelectric material BiFeO3, highlighting that photoinduced charge separation leads to specific deformations in the unit cell structure.
- The research utilizes advanced techniques like ultrafast x-ray absorption spectroscopy and computational modeling to provide insights into the mechanisms behind these changes, which are important for developing efficient devices like solar cells and actuators.
Article Abstract
The interaction of light with materials is an intensively studied research forefront, in which the coupling of radiation energy to selective degrees of freedom offers contact-free tuning of functionalities on ultrafast time scales. Capturing the fundamental processes and understanding the mechanism of photoinduced structural rearrangement are essential to applications such as photo-active actuators and efficient photovoltaic devices. Using ultrafast x-ray absorption spectroscopy aided by density functional theory calculations, we reveal the local structural arrangement around the transition metal atom in a unit cell of the photoferroelectric archetype BiFeO3 film. The out-of-plane elongation of the unit cell is accompanied by the in-plane shrinkage with minimal change of interaxial lattice angles upon photoexcitation. This anisotropic elastic deformation of the unit cell is driven by localized electric field as a result of photoinduced charge separation, in contrast to a global lattice constant increase and lattice angle variations as a result of heating. The finding of a photoinduced elastic unit cell deformation elucidates a microscopic picture of photocarrier-mediated non-equilibrium processes in polar materials.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4604520 | PMC |
| http://dx.doi.org/10.1038/srep15098 | DOI Listing |
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