Graphene - the strictly two-dimensional, honeycomb lattice of carbon atoms - is a two-dimensional electron gas system (2DEG) with unique and promising electronic properties. A high mobility of charge carriers, which depends only weakly on the temperature and on the carrier concentration, makes graphene an exciting candidate for novel electronic devices, probably even ballistic-transport-based devices. Band gap engineering by e.g. breaking of the sublattice symmetry, by gating of graphene double
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