Parity Effects in Few-Layer Graphene

We study the electronic properties in few-layer graphenes (FLGs) classified by even/odd layer number <i>n</i>. FLGs with even <i>n</i> have only parabolic energy dispersions, whereas FLGs with odd <i>n</i> have a linear dispersion besides parabolic ones. This difference leads to a distinct density of states in FLGs, experimentally confirmed by the gate-voltage dependence of the electric double-layer capacitance. Thus, FLGs with odd <i>n</i> are unique materials that have relativistic carriers originating in linear energy dispersion

Edge-Dependent Transport Properties in Graphene

Graphene has two kinds of edges which have different electronic properties. A singular electronic state emerges at zigzag edges, while it disappears at armchair edges. We study the edge-dependent transport properties in few-layer graphene by applying a side gate voltage to the edge with an ionic liquid. The devices indicating a conductance peak at the charge neutrality point have zigzag edges, confirmed by micro-Raman spectroscopy mapping. The hopping transport between zigzag edges increases the conductance