The ferroelectric photo ground state of SrTiO3: Cavity materials engineering

Latini, S.; Shin, D.; Sato, S.; Schäfer, C.; de Giovannini, U.; Hübener, H.; Rubio, A.

doi:10.1073/pnas.2105618118

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The ferroelectric photo ground state of SrTiO₃: Cavity materials engineering

MPS-Authors

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Latini, S.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;

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Shin, D.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;

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Sato, S.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;
Center for Computational Sciences, University of Tsukuba;

/persons/resource/persons180973

Schäfer, C.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;

/persons/resource/persons221949

de Giovannini, U.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;
Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del Paìs Vasco UPV/EHU;

/persons/resource/persons221951

Hübener, H.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;

/persons/resource/persons22028

Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;
Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del Paìs Vasco UPV/EHU;
Center for Computational Quantum Physics (CCQ), The Flatiron Institute;

External Resource

https://arxiv.org/abs/2101.11313
(Preprint)

https://dx.doi.org/10.1073/pnas.2105618118
(Publisher version)

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e2105618118.full.pdf
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pnas.2105618118.sapp.pdf
(Supplementary material), 3MB

Citation

Latini, S., Shin, D., Sato, S., Schäfer, C., de Giovannini, U., Hübener, H., et al. (2021). The ferroelectric photo ground state of SrTiO₃: Cavity materials engineering. Proceedings of the National Academy of Sciences of the United States of America, 118(31): e2105618118. doi:10.1073/pnas.2105618118.

Cite as: https://hdl.handle.net/21.11116/0000-0008-C046-0

Abstract

Controlling collective phenomena in quantum materials is a promising route toward engineering material properties on demand. Strong THz lasers have been successful at inducing ferroelectricity in SrTiO₃. Here we demonstrate, from atomistic calculations, that cavity quantum vacuum fluctuations induce a change in the collective phase of SrTiO₃ in the strong light–matter coupling regime. Under these conditions, the ferroelectric phase is stabilized as the ground state, instead of the quantum paraelectric one. We conceptualize this light–matter hybrid state as a material photo ground state: Fundamental properties such as crystal structure, phonon frequencies, and the collective phase of a material are determined by the quantum light–matter coupling in equilibrium conditions. Cavity-coupling adds a new dimension to the phase diagram of SrTiO₃.