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SLAC Publication: SLAC-PUB-16949
SLAC Release Date: May 24, 2017
Ultrafast x-ray diffraction probe of terahertz field-driven soft mode dynamics
Kozina, Michael.
We use ultrafast X-ray pulses to characterize the lattice response of SrTiO3 when driven by strong terahertz fields. We observe transient changes in the diffraction intensity with a delayed onset with respect to the driving field. Fourier analysis reveals two frequency components corresponding to the two lowest energy zone- center optical modes in SrTiO3. The lower frequency mode exhibits clear softening as the temperature is decreased while the higher frequency mode shows slight tem- perature d... Show Full Abstract
We use ultrafast X-ray pulses to characterize the lattice response of SrTiO3 when driven by strong terahertz fields. We observe transient changes in the diffraction intensity with a delayed onset with respect to the driving field. Fourier analysis reveals two frequency components corresponding to the two lowest energy zone- center optical modes in SrTiO3. The lower frequency mode exhibits clear softening as the temperature is decreased while the higher frequency mode shows slight tem- perature dependence. Show Partial Abstract
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  • Interest Categories: Material Sciences, Optics, X-Ray Free Electron Laser