Parity-forbidden excitations of Sr(2)CuO(2)Cl(2) revealed by optical third-harmonic spectroscopy.

نویسندگان

  • A B Schumacher
  • J S Dodge
  • M A Carnahan
  • R A Kaindl
  • D S Chemla
  • L L Miller
چکیده

We present the first study of nonlinear optical third-harmonic generation (THG) in the strongly correlated charge-transfer insulator Sr(2)CuO(2)Cl(2). For fundamental excitation in the near infrared, the THG spectrum reveals a strongly resonant response for photon energies near 0.7 eV. Polarization analysis reveals this novel resonance to be only partially accounted for by three-photon excitation to the optical charge-transfer exciton, and indicates that an even-parity state at 2 eV, with a(1g) symmetry, participates in the third-harmonic susceptibility.

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عنوان ژورنال:
  • Physical review letters

دوره 87 12  شماره 

صفحات  -

تاریخ انتشار 2001