Journal
PHYSICAL REVIEW B
Volume 90, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.134308
Keywords
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Funding
- Chinese National Key Basic Research Special Fund [2011CB922003]
- International Science and Technology Cooperation Program of China [2013DFA51430]
- National Natural Science Foundation of China [11174159, 11374164, 11304166]
- Fundamental Research Funds for the Central Universities [65145005]
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Femtosecond degenerate and nondegenerate pump-probe spectroscopy in graphene reveals the evolution of photoexcited carrier distribution in the energy band during relaxation: the initial occupation of photoexcited carriers centered at the excitation state is anisotropic in momentum space; this anisotropic distribution rapidly relaxes through an intermediate state argued to be fully isotropic in the energy band due to phonon-involved cascade scattering. In addition, the experiment suggests that graphene optical absorbances for in-plane and out-of-plane optical fields are identical.
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