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  Metastable ferroelectricity in optically strained SrTiO3

Nova, T. F., Disa, A., Fechner, M., & Cavalleri, A. (2019). Metastable ferroelectricity in optically strained SrTiO3. Science, 364(6445), 1075-1079. doi:10.1126/science.aaw4911.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-C953-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BF37-8
Genre: Journal Article

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https://arxiv.org/abs/1812.10560 (Preprint)
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https://dx.doi.org/10.1126/science.aaw4911 (Publisher version)
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 Creators:
Nova, T. F.1, 2, Author              
Disa, A.1, Author              
Fechner, M.1, Author              
Cavalleri, A.1, 2, 3, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
3Clarendon Laboratory, University of Oxford, ou_persistent22              

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 Abstract: Fluctuating orders in solids are generally considered high-temperature precursors of broken symmetry phases. However, in some cases, these fluctuations persist to zero temperature and prevent the emergence of long-range order. Strontium titanate (SrTiO3) is a quantum paraelectric in which dipolar fluctuations grow upon cooling, although a long-range ferroelectric order never sets in. Here, we show that optical excitation of lattice vibrations can induce polar order. This metastable polar phase, observed up to temperatures exceeding 290 kelvin, persists for hours after the optical pump is interrupted. Furthermore, hardening of a low-frequency vibration points to a photoinduced ferroelectric phase transition, with a spatial domain distribution suggestive of a photoflexoelectric coupling.

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Language(s): eng - English
 Dates: 2018-12-272019-05-202019-06-142019-06-14
 Publication Status: Published in print
 Pages: 5
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1812.10560
DOI: 10.1126/science.aaw4911
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Project name : We are grateful to T. Gebert for providing the beam propagation simulations. We thank A. Cartella for the help in building the OPA and K.Beyerlein for useful discussions. Funding: The research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC [grant agreement no. 319286 (QMAC)]. Author contributions: A.C. conceived the project together with T.F.N. T.F.N. and A.S.D designed the experiments and acquired and analyzed the data. M.F. developed the theoretical model and performed the DFT calculations. The manuscript was written by T.F.N. and A.C., with feedback from all coauthors. Competing interests: The authors declare no competing interests. Data availability: All data needed to evaluate the conclusions in the paper are present in the paper or the supplementary materials.
Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Science
  Other : Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: 5 Volume / Issue: 364 (6445) Sequence Number: - Start / End Page: 1075 - 1079 Identifier: ISSN: 0036-8075
CoNE: https://pure.mpg.de/cone/journals/resource/991042748276600_1