Graphene is a semimetal (zero-gap semiconductor), meaning that there are very few charge carriers compared to a normal metal. While semimetals generally have far smaller electrical and thermal conductivity than metals, this is not the case in graphene, which has an intrinsic resistivity about two-thirds of the resistivity of silver.
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Three independent groups have found the same type of superfast massless charge carriers in bulk sodium bismuthide and cadmium arsenide as give graphene its unusually large electrical and thermal conductivity.
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