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Two-photon resonant third-harmonic generation in La2CuO4.

A Schülzgen, Y Kawabe, E Hanamura

    Physical Review Letters
    |April 6, 2001
    PubMed
    Summary
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    We studied the electronic structure of La2CuO4 using advanced spectroscopy. Our findings reveal charge transfer excitations and resonance effects, matching theoretical models.

    Area of Science:

    • Condensed matter physics
    • Materials science
    • Solid-state physics

    Background:

    • La2CuO4 is a highly correlated electronic system with complex properties.
    • Understanding its electronic structure is crucial for various applications.

    Purpose of the Study:

    • Investigate the electronic structure of La2CuO4.
    • Identify key electronic excitations and their contributions to nonlinear optical properties.

    Main Methods:

    • Combined linear absorption and nonlinear third harmonic generation (THG) experiments.
    • Theoretical calculations using the excitonic cluster model.

    Main Results:

    • Demonstrated strong THG primarily from O (2p(sigma)) to Cu (3d(x2-y2)) charge transfer excitation.

    Related Experiment Videos

  • Observed pronounced spectral features due to three-photon and two-photon resonance enhancement.
  • Identified quantum interference effects and both odd and even symmetry excitation modes.

    • Conclusions:

    • The excitonic cluster model accurately reproduces the experimental THG spectrum.
    • Detailed electronic structure and excitation modes of La2CuO4 were elucidated.