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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
by
Hauber, A.
, Hoffmann, M. C.
, Savić, I.
, Chollet, M.
, Murray, É. D.
, Reis, D. A.
, Merlin, R.
, Zhu, D.
, May, A. F.
, Clark, J. N.
, Henighan, T.
, Lindenberg, A. M.
, Bray, C.
, Zalden, P.
, Trigo, M.
, Jiang, M. P.
, Kozina, M.
, Glownia, J. M.
, Sato, T.
, Sales, B. C.
, Delaire, O.
, Fahy, S.
2022
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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
by
Hauber, A.
, Hoffmann, M. C.
, Savić, I.
, Chollet, M.
, Murray, É. D.
, Reis, D. A.
, Merlin, R.
, Zhu, D.
, May, A. F.
, Clark, J. N.
, Henighan, T.
, Lindenberg, A. M.
, Bray, C.
, Zalden, P.
, Trigo, M.
, Jiang, M. P.
, Kozina, M.
, Glownia, J. M.
, Sato, T.
, Sales, B. C.
, Delaire, O.
, Fahy, S.
in
2022
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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
by
Hauber, A.
, Hoffmann, M. C.
, Savić, I.
, Chollet, M.
, Murray, É. D.
, Reis, D. A.
, Merlin, R.
, Zhu, D.
, May, A. F.
, Clark, J. N.
, Henighan, T.
, Lindenberg, A. M.
, Bray, C.
, Zalden, P.
, Trigo, M.
, Jiang, M. P.
, Kozina, M.
, Glownia, J. M.
, Sato, T.
, Sales, B. C.
, Delaire, O.
, Fahy, S.
2022
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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
Journal Article
Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering
2022
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Overview
We report the observation of photo-induced plasmon–phonon coupled modes in the group IV–VI semiconductor PbTe using ultrafast x-ray diffuse scattering at the Linac Coherent Light Source. We measure the near-zone-center excited-state dispersion of the heavily screened longitudinal optical (LO) phonon branch as extracted from differential changes in x-ray diffuse scattering intensity following above bandgap photoexcitation. We suggest that upon photoexcitation, the LO phonon-plasmon coupled (LOPC) modes themselves become coupled to longitudinal acoustic modes that drive electron band shifts via acoustic deformation potentials and possibly to low-energy single-particle excitations within the plasma and that these couplings give rise to displacement-correlations that oscillate in time with a period given effectively by the heavily screened LOPC frequency.
Publisher
American Institute of Physics,American Crystallographic Association,AIP Publishing LLC and ACA
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