Epitaxial graphene morphologies probed by weak (anti)-localization

Ather Mahmood (1) , Cécile Naud (2) , Clément Bouvier (2) , Fanny Hiebel (3) , Pierre Mallet (1) , Jean-Yves Veuillen (1) , Laurent Lévy (2) , Didier Chaussende (4) , Thierry Ouisse (4)

1 CP
2 NEEL - QuantECA - Circuits électroniques quantiques Alpes
3 TSNPE
4 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. Finally a graphical representation of the pseudospin diffusion illustrates the observed transition from localization to antilocalization.

Mots clés: epitaxial graphene; electronic transport; weak localization

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. 2012. ⟨hal-00705711v1⟩