Terahertz-driven phonon upconversion in SrTiO3
By M. Kozina, M. Fechner, P. Marsik, T. van Driel, J. Glownia, C. Bernhard, M. Radović, D. Zhu, Stefano Bonetti, U. Staub and 1 more. Nature Physics, 2018
179 citations recorded by the source corpus.
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.A spectroscopic study of strontium titanate provides a method for transferring the vibrational energy of a low-frequency phonon mode to higher-frequency modes, with the potential to access elusive ‘silent’ modes.
Subfields: Atomic and Molecular Physics, and Optics, Computational Mechanics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/1a7bdf4bc7078639786054ea36694f77fd9525be
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Colloquium: Nonthermal pathways to ultrafast control in quantum materials (2021, background): “B), as well as a means of mapping interatomic forces and potentials (von Hoegen et al., 2018; Kozina et al., 2019).”