Ultrafast carrier dynamics and radiative recombination in multiferroic BiFeO3 single crystals and thin films

Yu-Miin Sheu*, S. A. Trugman, J. Xiong, Y. S. Park, S. Lee, H. T. Yi, S. W. Cheong, Q. X. Jia, A. J. Taylor, R. P. Prasankumar

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

We report a detailed comparison of ultrafast carrier dynamics in single crystals and thin films of multiferroic BiFeO3 (BFO). Using degenerate femtosecond optical pump-probe spectroscopy, we find that the observed dynamics are qualitatively similar in both samples. After photoexcitation, electrons relax to the conduction band minimum through electron-phonon coupling, with subsequent carrier relaxation proceeding via various recombination pathways that extend to a nanosecond timescale. Subtle differences observed in our measurements indicate that BFO films have a higher band gap than single crystals. Overall, our results demonstrate that carrier relaxation in BFO is analogous to that in bulk semiconductors.

Original languageEnglish
Title of host publication18th International Conference on Ultrafast Phenomena, UP 2012
DOIs
StatePublished - 5 Apr 2013
Event18th International Conference on Ultrafast Phenomena, UP 2012 - Lausanne, Switzerland
Duration: 8 Jul 201213 Jul 2012

Publication series

NameEPJ Web of Conferences
Volume41
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

Conference18th International Conference on Ultrafast Phenomena, UP 2012
CountrySwitzerland
CityLausanne
Period8/07/1213/07/12

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