Observation of photo-induced plasmon-phonon coupling in PbTe via ultrafast x-ray scattering.
Journal
Structural dynamics (Melville, N.Y.)
ISSN: 2329-7778
Titre abrégé: Struct Dyn
Pays: United States
ID NLM: 101660872
Informations de publication
Date de publication:
Mar 2022
Mar 2022
Historique:
received:
25
09
2021
accepted:
18
02
2022
entrez:
21
3
2022
pubmed:
22
3
2022
medline:
22
3
2022
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 35311000
doi: 10.1063/4.0000133
pii: 4.0000133
pmc: PMC8923709
doi:
Types de publication
Journal Article
Langues
eng
Pagination
024301Informations de copyright
© 2022 Author(s).
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