Magneto-transport in Disordered Graphene: from Weak Localization to Strong Localization

Details Magneto-transport in Disordered Graphene: from Weak Localization to Strong Localization Magneto-transport in Disordered Graphene: from Weak Localization to Strong Localization

2010-03-05

arxiv.org/abs/1003.1299v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We present a magneto-transport study of graphene samples into which a mild disorder was introduced by exposure to ozone. Unlike the conductivity of pristine graphene, the conductivity of graphene samples exposed to ozone becomes very sensitive to temperature: it decreases by more than 3 orders of magnitude between 100K and 1K. By varying either an external gate voltage or temperature, we continuously tune the transport properties from the weak to the strong localization regime. We show that the transition occurs as the phase coherence length becomes comparable to the localization length. We also highlight the important role of disorder-enhanced electron-electron interaction on the resistivity.

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