Terahertz Coherent Acoustic Phonons in SrRuO3/SrTiO3 Superlattices

ORAL

Abstract

We utilized time-resolved pump-probe spectroscopy to generate and detect coherent acoustic phonons (CAPs) in SrRuO3/SrTiO3 superlattices with frequencies according to the spatial modulation of the heterostructures. Thanks to the pulse laser deposition techniques, precise manipulation of atomic layers enables the fabrication of high-quality heterostructures and generation of CAPs in THz regime. Dynamics of CAPs from hundreds of GHz to 1 THz were investigated. By introducing a control pulse, coherent control of CAPs was also demonstrated. Since many complex oxides with perovskite structures can be deposited on the SrRuO3/SrTiO3 superlattices, our demonstrated technique can be used to study their coherent acoustic properties in THz regime.

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Presenters

  • ChiYuan Yang

    Department of Physics, National Taiwan University

Authors

  • ChiYuan Yang

    Department of Physics, National Taiwan University

  • Pingchun Wu

    Department of Materials Science and Engineering, National Chiao Tung University, National Chiao Tung University

  • Ying-Hao Chu

    Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan; and Institute of Physics, Academia Sinica, Taipei, Taiwan, Department of Materials Science and Engineering, National Chiao Tung University, National Chiao Tung University, Materials Science and Engineering, National Chiao Tung University, National Chiao Tung University, Hsinchu 30010, Taiwan

  • Kung-Hsuan Lin

    Institute of Physics, Academia Sinica