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Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 7: 100 years since the Laue experiment: Topical aspects of diffraction and scattering (Joint Session KR, BP, CPP, DF, GP, MA, MI, MM; related to SYXD)

DF 7.3: Vortrag

Dienstag, 27. März 2012, 10:15–10:30, EMH 225

Brillouin scattering of ultrashort optical and x-ray pulses from quasi-monochromatic phonon wavepackets — •Marc Herzog1, André Bojahr1, Jevgenij Goldshteyn2, Steffen Mitscherling1, Wolfram Leitenberger1, Dmitry Khakhulin3, Michael Wulff3, Ionela Vrejoiu4, Roman Shayduk2, Peter Gaal1, and Matias Bargheer1,21Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 3Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 4European Synchrotron Radiation Facility, Grenoble, France

We excite a SrRuO3 thin film transducer epitaxially grown on a SrTiO3 substrate with pulse trains of ultrashort laser pulses. Each laser pulse launches single bipolar strain pulses of broad bandwidth into the substrate [1] which coherently add up to form a quasi-monochromatic sub-THz phonon wavepacket. The generation and dynamics of these phonon pulses is investigated by Brillouin scattering using visible and hard x-ray photons. The combination of both methods reveals the excited narrow phonon spectrum as well as the phonon lifetime which is on the order of a few 100 ps in the considered frequency range. This lifetime is explained by anharmonic phonon interactions.

[1] Thomsen et al., Phys. Rev. B 34, 4129 (1986).

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