Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering

Jiang, M. P.; Fahy, S.; Hauber, A.; Murray, É. D.; Savić, I.; Bray, C.; Clark, J. N.; Henighan, T.; Kozina, M.; Lindenberg, A. M.; Zalden, P.; Chollet, M.; Glownia, J. M.; Hoffmann, M. C.; Sato, T.; Zhu, D.; Delaire, O.; May, A. F.; Sales, B. C.; Merlin, R.; Trigo, M.; Reis, D. A.

doi:10.1063/4.0000133

Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering

Journal Article · Mon Mar 14 00:00:00 EDT 2022 · Structural Dynamics

DOI:https://doi.org/10.1063/4.0000133· OSTI ID:2565072

Jiang, M. P.; Fahy, S.; Hauber, A.; Murray, É. D.; Savić, I.; Bray, C.; Clark, J. N.; Henighan, T.; ; Lindenberg, A. M.; Zalden, P.; Chollet, M.; Glownia, J. M.; ; Sato, T.; Zhu, D.; Delaire, O.; ; Sales, B. C.; more »

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: Science Foundation Ireland; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-76SF00515; AC05-00OR22725

OSTI ID:: 2565072

Alternate ID(s):: OSTI ID: 1845877
OSTI ID: 1854943
OSTI ID: 1862115

Journal Information:: Structural Dynamics, Journal Name: Structural Dynamics Journal Issue: 2 Vol. 9; ISSN 2329-7778

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
phonon
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ultrafast science
x-ray diffraction
x-ray free-electron laser
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Observation of photo-induced plasmon–phonon coupling in PbTe via ultrafast x-ray scattering

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