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Title: Giant optical enhancement of strain gradient in ferroelectric BiFeO3 thin films and its physical origin

Through mapping of the spatiotemporal strain profile in ferroelectric BiFeO3 epitaxial thin films, we report an optically initiated dynamic enhancement of the strain gradient of 105–106 m-1 that lasts up to a few ns depending on the film thickness. Correlating with transient optical absorption measurements, the enhancement of the strain gradient is attributed to a piezoelectric effect driven by a transient screening field mediated by excitons. In conclusion, these findings not only demonstrate a new possible way of controlling the flexoelectric effect, but also reveal the important role of exciton dynamics in photostriction and photovoltaic effects in ferroelectrics.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7] ;  [1] ;  [1] ;  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Stanford Univ., CA (United States)
  3. Univ. of Wisconsin, Madison, WI (United States)
  4. Univ. of Connecticut, Storrs, CT (United States)
  5. Northwestern Univ., Evanston, IL (United States)
  6. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Cornell Univ., Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States). Kavli Inst. for Nanoscale Science
Publication Date:
OSTI Identifier:
1237489
Grant/Contract Number:
AC02-06CH11357; FG02-10ER46147
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Information storage; Solar cells; Ferroelectrics and multiferroics