| Autor: |
M. P. Jiang, S. Fahy, A. Hauber, É. D. Murray, I. Savić, C. Bray, J. N. Clark, T. Henighan, M. Kozina, A. M. Lindenberg, P. Zalden, M. Chollet, J. M. Glownia, M. C. Hoffmann, T. Sato, D. Zhu, O. Delaire, A. F. May, B. C. Sales, R. Merlin, M. Trigo, D. A. Reis |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Structural Dynamics, Vol 9, Iss 2, Pp 024301-024301-10 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2329-7778 |
| DOI: |
10.1063/4.0000133 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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