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Journal Article

Metastable ferroelectricity in optically strained SrTiO3

MPS-Authors
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Nova,  T. F.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
The Hamburg Centre for Ultrafast Imaging;

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Disa,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Fechner,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons133811

Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
The Hamburg Centre for Ultrafast Imaging;
Clarendon Laboratory, University of Oxford;

External Resource

https://arxiv.org/abs/1812.10560
(Preprint)

https://dx.doi.org/10.1126/science.aaw4911
(Publisher version)

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Fulltext (public)

1812.10560.pdf
(Preprint), 6MB

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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0002-C953-E
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.