Journal
PHYSICAL REVIEW B
Volume 93, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.104104
Keywords
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Funding
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
- Olle Enquist Byggmastare foundation
- Crafoord Foundation
- Carl Trygger Foundation
- FP7 Marie Curie Program [FANCEE]
- Russian Science Foundation [14-12-00511]
- Russian Science Foundation [14-12-00511] Funding Source: Russian Science Foundation
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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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