Terahertz Coherent Acoustic Phonons in SrRuO<sub>3</sub>/SrTiO<sub>3</sub> 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