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Terahertz Emission Study of Femtosecond Time-Transient Nonequilibrium State in Optically Excited YBa 2 Cu 3 O 7-δ Thin Films

1996; Institute of Physics; Volume: 35; Issue: 12A Linguagem: Inglês

10.1143/jjap.35.l1578

1347-4065

Masayoshi Tonouchi, Masahiko Tani Masahiko Tani, Zhen Wang Zhen Wang, Kiyomi Sakai Kiyomi Sakai, Noboru Wada, Masanori Hangyo Masanori Hangyo,

Advanced Chemical Physics Studies

We observed the temperature dependence of a femtosecond time-transient photoresponse in YBa 2 Cu 3 O 7-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.