Ferroelectric Soft Mode in a SrTiO3 Thin Film Impulsively Driven to the Anharmonic Regime Using Intense Picosecond Terahertz Pulses

I. Katayama, H. Aoki, J. Takeda, H. Shimosato, M. Ashida, R. Kinjo, I. Kawayama, M. Tonouchi, M. Nagai, and K. Tanaka
Phys. Rev. Lett. 108, 097401 – Published 28 February 2012

Abstract

The ferroelectric soft mode in a SrTiO3 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.

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  • Received 7 April 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.097401

© 2012 American Physical Society

Authors & Affiliations

I. Katayama1, H. Aoki2, J. Takeda2, H. Shimosato3, M. Ashida3,4, R. Kinjo5, I. Kawayama5, M. Tonouchi5, M. Nagai4,6, and K. Tanaka6,7,8

  • 1Interdisciplinary Research Center, Yokohama National University, Yokohama 240-8501, Japan
  • 2Graduate School of Engineering, Yokohama National University, Yokohama 240-8501, Japan
  • 3Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
  • 4PRESTO JST, Tokyo 102-0075, Japan
  • 5Institute of Laser Engineering, Osaka University, Suita 565-0871, Japan
  • 6Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 7iCeMS, Kyoto 606-8501, Japan
  • 8CREST JST, Tokyo 102-0075, Japan

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Issue

Vol. 108, Iss. 9 — 2 March 2012

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