Weak antilocalization in epitaxial graphene: evidence for chiral electrons

Details Weak antilocalization in epitaxial graphene: evidence for chiral electrons Weak antilocalization in epitaxial graphene: evidence for chiral electrons

2006-11-13

arxiv.org/abs/cond-mat/0611339v2

Phys. Rev. Lett. 98, 136801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures. Minor changes

Scientific paper

10.1103/PhysRevLett.98.136801

Transport in ultrathin graphite grown on silicon carbide is dominated by the electron-doped epitaxial layer at the interface. Weak anti-localization 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 graphene weak-(anti)localization theory implying the chiral electronic character of the samples. Scattering contributions from the trapped charges in the substrate and from trigonal warping due to the graphite layer on top are tentatively identified. The Shubnikov-de Haas oscillations are remarkably small and show an anomalous Berry's phase.

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