Localization of charge carriers in monolayer graphene gradually disordered by ion irradiation

Abstract

Gradual localization of charge carriers was studied in a series of micro-size samples of monolayer graphene fabricated on the common large scale film and irradiated by different doses of C${}^{+}$ ions with energy 35 keV. Measurements of the temperature dependence of conductivity and magnetoresistance in fields up to 4 T showed that at low disorder, the samples are in the regime of weak localization and antilocalization. Further increase of disorder leads to strong localization regime, when conductivity is described by the variable-range-hopping (VRH) mechanism. A crossover from the Mott regime to the Efros-Shklovskii regime of VRH is observed with decreasing temperature. Theoretical analysis of conductivity in both regimes showed a remarkably good agreement with experimental data.

Latex, 5 pages, 5 eps Figures. As accepted for publication in Graphene

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Cited by in corpus (5)

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• Influence of ageing on Raman spectra and the conductivity of monolayer graphene samples irradiated by heavy and light ions
• Charge carrier transport asymmetry in monolayer graphene
• Finite-size scaling in a 2D disordered electron gas with spectral nodes
• Irradiation-induced metal-insulator transition in monolayer graphene