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Terahertz-driven phonon upconversion in SrTiO 3

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

In: Nature Physics, 2019, vol. 15, no. 4, p. 387–392

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...