Electronic origin of ultrafast photoinduced strain in BiFeO3

Haidan Wen, Pice Chen, Margaret P. Cosgriff, Donald A. Walko, June Hyuk Lee, Carolina Adamo, Richard D. Schaller, Jon F. Ihlefeld, Eric M. Dufresne, Darrell G. Schlom, Paul G. Evans, John W. Freeland, Yuelin Li

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


Above-band-gap optical excitation produces interdependent structural and electronic responses in a multiferroic BiFeO3 thin film. Time-resolved synchrotron x-ray diffraction shows that photoexcitation can induce a large out-of-plane strain, with magnitudes on the order of half of one percent following pulsed-laser excitation. The strain relaxes with the same nanosecond time dependence as the interband relaxation of excited charge carriers. The magnitude of the strain and its temporal correlation with excited carriers indicate that an electronic mechanism, rather than thermal effects, is responsible for the lattice expansion. The observed strain is consistent with a piezoelectric distortion resulting from partial screening of the depolarization field by charge carriers, an effect linked to the electronic transport of excited carriers. The nonthermal generation of strain via optical pulses promises to extend the manipulation of ferroelectricity in oxide multiferroics to subnanosecond time scales.

Original languageEnglish
Article number037601
JournalPhysical review letters
Issue number3
Publication statusPublished - Jan 18 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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