Ultrafast X-ray diffraction probe of terahertz field-driven soft mode dynamics in SrTiO(3)

We use ultrafast X-ray pulses to characterize the lattice response of SrTiO(3) 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...

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Detalles Bibliográficos
Autores principales: Kozina, M., van Driel, T., Chollet, M., Sato, T., Glownia, J. M., Wandel, S., Radovic, M., Staub, U., Hoffmann, M. C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Crystallographic Association 2017
Materias:
ARTICLES
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5415405/
https://www.ncbi.nlm.nih.gov/pubmed/28503632
http://dx.doi.org/10.1063/1.4983153
Descripción
Sumario:We use ultrafast X-ray pulses to characterize the lattice response of SrTiO(3) 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 SrTiO(3). The lower frequency mode exhibits clear softening as the temperature is decreased while the higher frequency mode shows slight temperature dependence.

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