1. Femtosecond x-ray diffraction study of multi-THz coherent phonons in SrTiO3.
- Author
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Shayduk, Roman, Hallmann, Jörg, Rodriguez-Fernandez, Angel, Scholz, Markus, Lu, Wei, Bösenberg, Ulrike, Möller, Johannes, Zozulya, Alexey, Jiang, Man, Wegner, Ulrike, Secareanu, Radu-Costin, Palmer, Guido, Emons, Moritz, Lederer, Max, Volkov, Sergey, Lindfors-Vrejoiu, Ionela, Schick, Daniel, Herzog, Marc, Bargheer, Matias, and Madsen, Anders
- Subjects
FEMTOSECOND pulses ,X-ray diffraction ,PHONONS ,FREE electron lasers ,ACOUSTIC phonons ,INFRARED lasers ,WAVE packets - Abstract
We report generation of ultra-broadband longitudinal acoustic coherent phonon wavepackets in SrTiO
3 (STO) with frequency components extending throughout the first Brillouin zone. The wavepackets are efficiently generated in STO using femtosecond infrared laser excitation of an atomically flat 1.6 nm-thick epitaxial SrRuO3 film. We use femtosecond x-ray diffraction at the European X-Ray Free Electron Laser Facility to study the dispersion and damping of phonon wavepackets. The experimentally determined damping constants for multi-THz frequency phonons compare favorably to the extrapolation of a simple ultrasound damping model over several orders of magnitude. [ABSTRACT FROM AUTHOR]- Published
- 2022
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