Аннотация
Transient polarized pump/probe transmission changes upon pulse
photoexcitation at 1.6 eV were measured in chiral enriched carbon
nanotubes ensembles of both metallic and semiconductor characters, in a
very broad probe spectral range from mid-IR to visible, combining
several ultrafast laser systems. We identify a photoinduced absorption
band at similar to 0.7 eV as due to hot Dirac fermions in the metallic
tubes and measure its dynamics. The hot carriers equilibrate within the
electronic system in similar to 400 fs and with the lattice within
similar to 2 ps; in agreement with hot Dirac fermions thermalization in
graphene. We also assign excitonic transitions in the semiconducting
tubes, mainly of (6,5) chirality; in particular, an intraexciton
transition at similar to 0.4 eV represents a lower limit for the exciton
binding energy.
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