Parity-Forbidden Excitations of Sr2CuO2Cl2 Revealed by Optical Third-Harmonic Spectroscopy

A. B. Schumacher, J. S. Dodge, M. A. Carnahan, R. A. Kaindl, D. S. Chemla, L. L. Miller

Research output: Contribution to journalArticlepeer-review


We present the first study of nonlinear optical third-harmonic generation (THG) in the strongly correlated charge-transfer insulator Sr2CuO2Cl2. 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.

Original languageEnglish (US)
Pages (from-to)127006-127006-4
JournalPhysical Review Letters
Issue number12
StatePublished - Sep 17 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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