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Araujo, E. N. D.; Brant, J. C.; Archanjo, B. S.; Medeiros-Ribeiro, G.; Plentz, F.; Alves, E. S.
Physical review. B, Condensed matter and materials physics, 06/2015, Letnik: 91, Številka: 24Journal Article
A helium ion microscope is used to produce nanoscale patterns on different regions of a graphene device. The patterns consist of uniformly spaced strips with varying spacing in each region. Measurements of the longitudinal magnetoconductivity in each region at different temperatures and carrier densities reveal a transition from metallic to insulating regimes as the density of defects increases. We use the weak localization theory and Mott's theory for disordered two-dimensional systems to analyze the conductivity as it crosses the threshold value of 4e super(2)/h.
