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Title: Capturing ultrafast photoinduced local structural distortion of BiFeO3

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep15098· OSTI ID:1237930
 [1];  [2];  [3];  [4];  [5];  [2];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of Science and Technology of China, Hefei (China)
  4. Cornell Univ., Ithaca, NY (United States)
  5. Cornell Univ., Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States). Kavli Inst. for Nanoscale Science

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1237930
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

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Cited By (10)

Photovoltaics with Ferroelectrics: Current Status and Beyond journal May 2016
Tuning Ultrafast Photoinduced Strain in Ferroelectric‐Based Devices journal May 2019
Direct observation of the electronic states of photoexcited hematite with ultrafast 2p3d X-ray absorption spectroscopy and resonant inelastic X-ray scattering journal January 2020
Light enhanced moisture degradation of perovskite solar cell material CH 3 NH 3 PbI 3 journal January 2019
Photostriction and elasto-optic response in multiferroics and ferroelectrics from first principles journal January 2018
Ab initio approach to photostriction in classical ferroelectric materials journal July 2017
Photostriction in Ferroelectrics from Density Functional Theory journal June 2016
Optical Writing of Magnetic Properties by Remanent Photostriction journal September 2016
Photostrictive Two-Dimensional Materials in the Monochalcogenide Family journal May 2017
Upgrade of laser pump time-resolved X-ray probes in Beijing synchrotron journal October 2019

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