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