Magneto-transport properties of a random distribution of few-layer graphene patches.

Fabrice Iacovella (1) , Pierre Trinsoutrot (2) , Anatolie Mitioglu (1) , Véronique Conédéra (3) , Mathieu Pierre (1) , Bertrand Raquet (1) , Michel Goiran (1) , Hugues Vergnes (2) , Brigitte Caussat (2) , Paulina Plochocka (4) , Walter Escoffier (1)

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
2 LGC - Laboratoire de Génie Chimique
3 LAAS-TEAM - Service Techniques et Équipements Appliqués à la Microélectronique
4 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble

In this study, we address the electronic properties of conducting films constituted of an array of randomly distributed few layer graphene patches and investigate on their most salient galvanometric features in the moderate and extreme disordered limit. We demonstrate that, in annealed devices, the ambipolar behaviour and the onset of Landau level quantization in high magnetic field constitute robust hallmarks of few-layer graphene films. In the strong disorder limit, however, the magnetotransport properties are best described by a variable-range hopping behaviour. A large negative magneto-conductance is observed at the charge neutrality point, in consistency with localized transport regime.

Mots clés: Magneto transport properties; Graphene

Domaines: Chimie-Physique [physics.chem-ph]; Electromagnétisme

Fabrice Iacovella, Pierre Trinsoutrot, Anatolie Mitioglu, Véronique Conédéra, Mathieu Pierre, et al.. Magneto-transport properties of a random distribution of few-layer graphene patches.. Journal of Applied Physics, 2014, 116 (19), pp.1-7. ⟨10.1063/1.4901953⟩. ⟨hal-01699088⟩