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, 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, and D. A. Reis
TL;DR
This study observes photo-induced plasmon-phonon coupling in PbTe, revealing how photoexcitation affects phonon dispersion using advanced X-ray scattering techniques.
Contribution
It provides the first direct measurement of photo-induced plasmon-phonon coupled modes in PbTe via Fourier-transform inelastic X-ray scattering.
Findings
Detection of photo-induced plasmon-phonon coupled modes
Measurement of LO phonon dispersion changes after photoexcitation
Insights into carrier-phonon interactions in PbTe
Abstract
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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Taxonomy
TopicsPhotorefractive and Nonlinear Optics · Chalcogenide Semiconductor Thin Films · Advanced Chemical Physics Studies