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- W2134857013 abstract "Abstract Coherent phonons and electronic response of the spin-Peierls compound CuGeO 3 are investigated at room temperature using time-resolved transmission measurement. Four A g modes are observed strongly in the E ∥ b polarization, consistent with the Raman spectra. Coherent lattice oscillation with the highest frequency of 860 cm −1 is kicked on with an initial phase of −(0.5±0.2) π radian and decays with a time constant of about 0.9 ps, indicating the ground-state phonon is induced by the process of impulsive stimulated Raman scattering (ISRS). The decay-time constants are rather long compared to the values expected from the line width of the stationary Raman spectrum. In addition, instantaneous photo-induced absorption is observed in the E ∥ b polarization at delay-time zero, whose temporal width is close to that of the cross-correlation between pump and probe, attributed to the two-photon absorption of the pump and the probe photons. The intensity of the negative peak-like response at delay-time zero increases in the E ∥ c polarization, and is ascribed to a cascade excitation via the Zhang–Rice (ZR)-like exciton. This absorption decays rapidly within 100 fs, indicating that the ZR excitons experience extremely fast relaxation after photoexcitation." @default.
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- W2134857013 date "2008-05-01" @default.
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- W2134857013 title "Ultrafast time-resolved spectroscopy of the spin-Peierls compound CuGeO3" @default.
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- W2134857013 doi "https://doi.org/10.1016/j.jlumin.2007.11.005" @default.
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