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  • Size-dependent hot-phonon dynamics in graphene flakes

    Author(s)
    Cunning, Benjamin V
    Ishioka, Kunie
    Brown, Christopher L
    Kielpinski, Dave
    Griffith University Author(s)
    Brown, Chris L.
    Cunning, Ben V.
    Kielpinski, David
    Year published
    2014
    Metadata
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    Abstract
    We examine the ultrafast carrier phonon dynamics in graphene flakes with different lateral sizes. By using a size-selective centrifugation technique, we create graphene films with graphene flake sizes in the region of 120-450?nm. The transient transmission exhibits two-step relaxation, which are attributed to carrier thermalization followed by hot phonon cooling. We find that the cooling of the hot phonons proceeds faster, by a factor of three, for the smallest graphene flakes.We examine the ultrafast carrier phonon dynamics in graphene flakes with different lateral sizes. By using a size-selective centrifugation technique, we create graphene films with graphene flake sizes in the region of 120-450?nm. The transient transmission exhibits two-step relaxation, which are attributed to carrier thermalization followed by hot phonon cooling. We find that the cooling of the hot phonons proceeds faster, by a factor of three, for the smallest graphene flakes.
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    Journal Title
    Applied Physics Letters
    Volume
    104
    DOI
    https://doi.org/10.1063/1.4875580
    Subject
    Physical sciences
    Nonlinear optics and spectroscopy
    Engineering
    Publication URI
    http://hdl.handle.net/10072/66820
    Collection
    • Journal articles

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