Ultrafast relaxation dynamics of hot optical phonons in graphene
By Haining Wang, J. Strait, P. George, S. Shivaraman, V. Shields, M. Chandrashekhar, Jeonghyun Hwang, C. Ruiz-Vargas, Farhan Rana, M. Spencer and 1 more. 2009
270 citations recorded by the source corpus.
Using ultrafast optical pump-probe spectroscopy, we study the relaxation dynamics of hot optical phonons in few-layer and multilayer graphene films grown by epitaxy on silicon carbide substrates and by chemical vapor deposition on nickel substrates. In the first few hundred femtoseconds after photoexcitation, the hot carriers lose most of their energy to the generation of hot optical phonons which then present the main bottleneck to subsequent cooling. Optical phonon cooling on short time scales is found to be independent of the graphene growth technique, the number of layers, and the type of the substrate. We find average phonon lifetimes in the 2.5–2.55 ps range. We model the relaxation dynamics of the coupled carrier-phonon system with rate equations and find a good agreement between the experimental data and the theory. The extracted optical phonon lifetimes agree very well with the theory based on anharmonic phonon interactions.
Subfields: Atomic and Molecular Physics, and Optics, Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/e12109d735151da8dd84f4b6ac7df65e2ff39abd
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In Atomic and Molecular Physics, and Optics
In Civil and Structural Engineering
In Materials Chemistry
- M. Freitag
- Phaedon Avouris
- Joerg Appenzeller
- Shinji Yamashita
- Frank Schwierz
- Yu-ming Lin
- Joachim Knoch
- A. Di Bartolomeo
Citations in the corpus
- Graphene Photonics, Plasmonics, and Optoelectronics (2014, background): “The decay via optical phonons is fast, taking place on a few picosecond time scale [26].”