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Ultrafast pseudospin dynamics in graphene


LPS Bât. 510, Orsay, Petit amphi

We address a long standing problem of pseudospin control in graphene from both experimental and theoretical point of view. The outcome of this work is twofold. First, we provide a conclusive evidence of the anisotropic photocarrier occupation (i. e. pseudospin polarization) in graphene caused by interaction between pseudospin and linearly polarized light. This peculiar phenomenon has long been discussed in numerous theoretical papers but its direct observation in a truly single layer graphene (rather than in multilayer stacks utilized before) was, up to now, missing. Second, we clarify the mechanisms responsible for the photocarrier occupation isotropization (i. e. pseudospin randomization) using an entirely analytical model specially developed for our experimental settings. The main driving isotropization mechanism is discovered to be optical phonon emission rather than electron-electron scattering, further distinguishing graphene from conventional semiconductors.
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