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arxiv 2109.01301 v1 pith:N6O3AE3X submitted 2021-09-03 cond-mat.mtrl-sci

Photo-induced plasmon-phonon coupling in PbTe

M. P. Jiang , M. Trigo , S. Fahy , A. Hauber , \'E. D. Murray , I Savi\'c , C. Bray , J. N. Clark
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T. Henighan M. Kozina M. Chollet J. M. Glownia M. C. Hoffmann D. Zhu O. Delaire A. F. May B. C. Sales A. M. Lindenberg P. Zalden T. Sato R. Merlin D. A. Reis
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classification cond-mat.mtrl-sci
keywords pbtephoto-inducedplasmon-phononscatteringx-rayabovebandbranch
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We report the observation of photo-induced plasmon-phonon coupled modes in the group IV-VI semiconductor PbTe using Fourier-transform inelastic X-ray scattering at the Linac Coherent Light Source (LCLS). We measure the near-zone-center dispersion of the heavily screened longitudinal optical (LO) phonon branch as extracted from differential changes in x-ray diffuse scattering intensity following above band gap photoexcitation.

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