Microscopic view on the ultrafast photoluminescence from photoexcited graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 25616043.
- Also identified by DOI 10.1021/nl504176z.
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Abstract
We present a joint theory-experiment study on ultrafast photoluminescence from photoexcited graphene. On the basis of a microscopic theory, we reveal two distinct mechanisms behind the occurring photoluminescence: besides the well-known incoherent contribution driven by nonequilibrium carrier occupations, we found a coherent part that spectrally shifts with the excitation energy. In our experiments, we demonstrate for the first time the predicted appearance and spectral shift of the coherent photoluminescence.