title: Two-photon resonant third-harmonic generation in La2CuO4.
abstract: Combining linear absorption and nonlinear third harmonic generation (THG) experiments, we investigate details of the electronic structure of the highly correlated electronic system in La2CuO4. We demonstrate strong THG mainly due to the charge transfer excitation from O (2p(sigma)) to Cu (3d(x2-y2)). The THG spectrum shows pronounced features due to three-photon and two-photon resonance enhancement as well as quantum interference effects. We obtain excellent agreement with a THG spectrum calculated in terms of the excitonic cluster model and can identify both odd and even symmetry excitation modes.
authors: A
authors: A
authors: Schülzgen
authors: Y
authors: Y
authors: Kawabe
authors: E
authors: E
authors: Hanamura
authors: A
authors: A
authors: Yamanaka
authors: P A
authors: PA
authors: Blanche
authors: J
authors: J
authors: Lee
authors: H
authors: H
authors: Sato
authors: M
authors: M
authors: Naito
authors: N T
authors: NT
authors: Dan
authors: S
authors: S
authors: Uchida
authors: Y
authors: Y
authors: Tanabe
authors: N
authors: N
authors: Peyghambarian