Terahertz Emission Study of Femtosecond Time-Transient Nonequilibrium State in Optically Excited YBa2Cu3O7-.DELTA. Thin Films.

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  • Tonouchi Masayoshi
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Tani Masahiko
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Wang Zhen
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Sakai Kiyomi
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Wada Noboru
    Research Center for Superconducting Materials and Electronics, Osaka University, Yamadaoka, Suita, Osaka 565, Japan
  • Hangyo Masanori
    Research Center for Superconducting Materials and Electronics, Osaka University, Yamadaoka, Suita, Osaka 565, Japan

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  • Terahertz Emission Study of Femtosecond Time-Transient Nonequilibrium State in Optically Excited YBa2Cu3O7-δ Thin Films
  • Terahertz Emission Study of Femtosecond
  • Terahertz Emission Study of Femtosecond Time-Transient Nonequilibrium State in Optically Excited YBa<sub> 2</sub>Cu<sub> 3</sub>O<sub> 7-δ</sub> Thin Films

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Abstract

We observed the temperature dependence of a femtosecond time-transient photoresponse in YBa2Cu3O7-δ thin films by detecting terahertz (THz) emission. Ultrashort electromagnetic pulses which are referred to as THz emission were generated by ultrafast supercurrent modulation with femtosecond laser pulse irradiation. The transient response is discussed in relation to the quasiparticle dynamics of the nonequilibrium superconductor.

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