Parity forbidden excitations of Sr2CuO2Cl2 revealed by optical third-harmonic spectroscopy

Details Parity forbidden excitations of Sr2CuO2Cl2 revealed by optical third-harmonic spectroscopy Parity forbidden excitations of Sr2CuO2Cl2 revealed by optical third-harmonic spectroscopy

2001-05-25

arxiv.org/abs/cond-mat/0105502v1

Physics

Condensed Matter

Strongly Correlated Electrons

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Scientific paper

10.1103/PhysRevLett.87.127006

We present the first study of nonlinear optical third harmonic generation 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 excitation at 2 eV, with a_1g symmetry, participates in the third harmonic susceptibility.

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