Ferroelectric soft mode in a SrTiO3 thin film impulsively driven to the anharmonic regime using intense picosecond terahertz pulses

Ferroelectric soft mode in a SrTiO3 thin film impulsively driven to the anharmonic regime using intense picosecond terahertz pulses

The ferroelectric soft mode in a SrTiO(3) thin film was impulsively driven to a large amplitude using intense picosecond terahertz pulses. As the terahertz electric field increased, the soft-mode absorption peak exhibited blueshifting and spectral narrowing. A classical anharmonic oscillator model s...

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Veröffentlicht in:Physical review letters 2012-03, Vol.108 (9), p.097401-097401
Hauptverfasser: Katayama, I, Aoki, H, Takeda, J, Shimosato, H, Ashida, M, Kinjo, R, Kawayama, I, Tonouchi, M, Nagai, M, Tanaka, K
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container_end_page 097401
container_issue 9
container_start_page 097401
container_title Physical review letters
container_volume 108
creator Katayama, I
Aoki, H
Takeda, J
Shimosato, H
Ashida, M
Kinjo, R
Kawayama, I
Tonouchi, M
Nagai, M
Tanaka, K
description The ferroelectric soft mode in a SrTiO(3) thin film was impulsively driven to a large amplitude using intense picosecond terahertz pulses. As the terahertz electric field increased, the soft-mode absorption peak exhibited blueshifting and spectral narrowing. A classical anharmonic oscillator model suggests that the induced displacement is comparable to that of the ferroelectric phase transition. The spectral narrowing indicates that the displacement exceeds that induced by any inhomogeneities in the film, demonstrating that the method can be used to explore intrinsic quartic anharmonicity.
doi_str_mv 10.1103/physrevlett.108.097401
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title Ferroelectric soft mode in a SrTiO3 thin film impulsively driven to the anharmonic regime using intense picosecond terahertz pulses
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