Journal article
Phonon-phonon interactions in photoexcited graphite studied by ultrafast electron diffraction
Physical review. B, v 93(10)
07 Mar 2016
Abstract
We investigated phonon-phonon interactions in photoexcited single-crystalline graphite by ultrafast electron diffraction. Transient electron diffraction profiles from a 35 nm graphite film were observed following laser excitation. Changes in intensities of diffraction spots revealed a two-exponential relaxation process with <0.5 ps and similar to 8 ps time scales. Furthermore, the transient thermal diffuse scattering signal showed evidence for population of phonons across the Gamma K and Gamma M branches of the phonon dispersion spectrum on a <2 ps time scale. Based on these dynamics, we conclude that the fast relaxation process corresponds to decay of strongly coupled optical phonons, and the slow relaxation process to redistribution of phonon energy to the equilibrium thermal distribution.
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Details
- Title
- Phonon-phonon interactions in photoexcited graphite studied by ultrafast electron diffraction
- Creators
- M. Harb - Drexel UniversityH. Enquist - Lund UniversityA. Jurgilaitis - Lund UniversityF. T. Tuyakova - University of Eastern FinlandA. N. Obraztsov - University of Eastern FinlandJ. Larsson - Lund University
- Publication Details
- Physical review. B, v 93(10)
- Publisher
- Amer Physical Soc
- Number of pages
- 7
- Grant note
- Crafoord Foundation 14-12-00511 / Russian Science Foundation; Russian Science Foundation (RSF) Swedish Research Council (VR); Swedish Research Council Olle Enquist Byggmastare foundation Carl Trygger Foundation Knut and Alice Wallenberg Foundation; Knut & Alice Wallenberg Foundation FANCEE / FP7 Marie Curie Program
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000371732000002
- Scopus ID
- 2-s2.0-84960871954
- Other Identifier
- 991019168395504721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter