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

Albrecht Bartels, Thomas Dekorsy, and Heinrich Kurz
Phys. Rev. Lett. 84, 2981 – Published 27 March 2000
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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.

  • Received 15 November 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.2981

©2000 American Physical Society

Authors & Affiliations

Albrecht Bartels*, Thomas Dekorsy, and Heinrich Kurz

  • Institut für Halbleitertechnik, Rheinisch-Westfälische Technische Hochschule Aachen, Sommerfeldstrasse 24, D-52056 Aachen, Germany

  • *Email address: bartels2@iht-ii.rwth-aachen.de

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Vol. 84, Iss. 13 — 27 March 2000

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