Epitaxial graphene morphologies probed by weak (anti)-localization

Ather Mahmood , Cécile Naud (1) , Clément Bouvier (1) , Fanny Hiebel , Pierre Mallet (2) , Jean-Yves Veuillen (2) , Laurent Lévy (1) , Didier Chaussende (3) , Thierry Ouisse (3)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 NEEL - QuNES - Nano-Electronique Quantique et Spectroscopie
3 LMGP - Laboratoire des matériaux et du génie physique

We show how the weak field magneto-conductance can be used as a tool to characterize epitaxial graphene samples grown from the C or the Si face of Silicon Carbide, with mobilities ranging from 120 to 12000 cm^2/(V.s). Depending on the growth conditions, we observe anti-localization and/or localization which can be understood in term of weak-localization related to quantum interferences. The inferred characteristic diffusion lengths are in agreement with the scanning tunneling microscopy and the theoretical model which describe the ''pure'' mono-layer and bilayer of graphene [MacCann et al,. Phys. Rev. Lett. 97, 146805 (2006)].

Mots clés: electronic transport; weak localization; epitaxial graphene

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Ather Mahmood, Cécile Naud, Clément Bouvier, Fanny Hiebel, Pierre Mallet, et al.. Epitaxial graphene morphologies probed by weak (anti)-localization. Journal of Applied Physics, 2013, 113 (8), pp.083715. ⟨10.1063/1.4793591⟩. ⟨hal-00705711v2⟩