Optical control of material properties is usually limited to the region that absorbs the light. Coupling to lattice vibrations that travel close to the speed of light allows ultrafast modulation of polarization deep inside a ferroelectric material.
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Abreu, E. Controlling ferroelectricity below the surface. Nat. Phys. 18, 375–376 (2022). https://doi.org/10.1038/s41567-022-01551-w
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DOI: https://doi.org/10.1038/s41567-022-01551-w