Evidence for weak antilocalization in epitaxial graphene
Abstract
Transport in ultrathin graphite on silicon carbide is graphene-like and appears to be dominated by the electron-doped epitaxial graphene layer at the interface. Weak antilocalization in 2D samples manifests itself as a broad cusp-like depression in the longitudinal resistance for magnetic fields 10 mT<B<5 T. An extremely sharp weak-localization resistance peak at B=0 is also observed. These features quantitatively agree with recent graphene weak-localization theory. Scattering contributions from charges in the substrate and from trigonal warping due to the graphite layer are tentatively identified. The Shubnikov-de Haas oscillations show an anomalous Berry's phase. Their small amplitudes may be related to graphene scattering processes.Keywords
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