## Impulsive Excitation of Phonon-Pair Combination States by Second-Order Raman Scattering

2000
Kurz, Heinrich
Journal article
##### Published in
Physical review letters ; 84 (2000), 13. - pp. 2981-2984
##### Abstract
The excitation of (100)-oriented KTaO3 with 25-fs laser pulses impulsively drives phonon-pair combination states via second-order Raman scattering. Oscillations in the phonon-amplitude covariance at the sum and difference frequency of the two involved phonons are observed in a spectrally and temporally resolved pump-probe experiment. Transmission changes of the sample are dominated by contributions of wave vector conserving phonon-pair combinations from the entire Brillouin zone that have maxima in their combined density of states. For low temperatures the temperature dependence of the covariance oscillations of different phonon combinations is reproduced by a quantum-mechanical model.
530 Physics
##### Cite This
ISO 690BARTELS, Albrecht, Thomas DEKORSY, Heinrich KURZ, 2000. Impulsive Excitation of Phonon-Pair Combination States by Second-Order Raman Scattering. In: Physical review letters. 84(13), pp. 2981-2984. Available under: doi: 10.1103/PhysRevLett.84.2981
BibTex
@article{Bartels2000Impul-8868,
year={2000},
doi={10.1103/PhysRevLett.84.2981},
title={Impulsive Excitation of Phonon-Pair Combination States by Second-Order Raman Scattering},
number={13},
volume={84},
journal={Physical review letters},
pages={2981--2984},
author={Bartels, Albrecht and Dekorsy, Thomas and Kurz, Heinrich}
}

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<dcterms:abstract xml:lang="eng">The excitation of (100)-oriented KTaO3 with 25-fs laser pulses impulsively drives phonon-pair combination states via second-order Raman scattering. Oscillations in the phonon-amplitude covariance at the sum and difference frequency of the two involved phonons are observed in a spectrally and temporally resolved pump-probe experiment. Transmission changes of the sample are dominated by contributions of wave vector conserving phonon-pair combinations from the entire Brillouin zone that have maxima in their combined density of states. For low temperatures the temperature dependence of the covariance oscillations of different phonon combinations is reproduced by a quantum-mechanical model.</dcterms:abstract>