Mapping nanoscale carrier confinement in polycrystalline graphene by terahertz spectroscopy by Patrick R. Whelan, Domenico De Fazio, Iwona Pasternak, Joachim D. Thomsen, Steffen Zelzer, Martin O. Mikkelsen, Timothy J. Booth, Lars Diekhöner, Ugo Sassi, Duncan Johnstone, Paul A. Midgley, Wlodek Strupinski, Peter U. Jepsen, Andrea C. Ferrari, Peter Bøggild

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