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Near zero carrier density, graphene exhibits positive photoconductivity and negative photoconductivity at high carrier density, governed by the interplay between photoinduced changes of both the Drude weight and the carrier scattering rate. For instance, if a person leans against a wall, the wall pushes horizontally on the person. In researchers magnetized graphene by placing it on an atomically smooth layer of magnetic yttrium iron garnet , maintaining graphene's electronic properties unaffected.
