Terahertz-driven phonon upconversion in SrTiO3

Kozina, M.; Fechner, M.; Marsik, P.; van Driel, T.; Glownia, J. M.; Bernhard, C.; Radovic, M.; Zhu, D.; Bonetti, S.; Staub, U.; Hoffmann, M. C.

doi:10.1038/s41567-018-0408-1

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Terahertz-driven phonon upconversion in SrTiO₃

MPG-Autoren

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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;

Externe Ressourcen

https://dx.doi.org/10.1038/s41567-018-0408-1
(Verlagsversion)

https://arxiv.org/abs/1807.10788
(Preprint)

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THz_phonon_upconversion_revision_V3.pdf
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Zitation

Kozina, M., Fechner, M., Marsik, P., van Driel, T., Glownia, J. M., Bernhard, C., et al. (2019). Terahertz-driven phonon upconversion in SrTiO₃. Nature Physics, 15(4), 387-392. doi:10.1038/s41567-018-0408-1.

Zitierlink: https://hdl.handle.net/21.11116/0000-0003-5F9B-5

Zusammenfassung

Direct manipulation of the atomic lattice using intense long-wavelength laser pulses has become a viable approach to create new states of matter in complex materials. Conventionally, a high-frequency vibrational mode is driven resonantly by a mid-infrared laser pulse and the lattice structure is modified through indirect coupling of this infrared-active phonon to other, lower-frequency lattice modulations. Here, we drive the lowest-frequency optical phonon in the prototypical transition metal oxide SrTiO₃ well into the anharmonic regime with an intense terahertz field. We show that it is possible to transfer energy to higher-frequency phonon modes through nonlinear coupling. Our observations are carried out by directly mapping the lattice response to the coherent drive field with femtosecond X-ray pulses, enabling direct visualization of the atomic displacements.