Ultrafast x-ray diffraction probe of terahertz field-driven soft mode dynamics
Autor: | Kozina, M., van Driel, T., Chollet, M., Sato, T., Glownia, J. M., Wandel, S., Radovic, M., Staub, U., Hoffmann, M. C. |
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Rok vydání: | 2017 |
Předmět: | |
Druh dokumentu: | Working Paper |
Popis: | We use ultrafast x-ray pulses to characterize the lattice response of SrTiO3 when driven by strong terahertz (THz) 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 temperature dependence. Comment: 15 pages, 5 figures |
Databáze: | arXiv |
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