Graphene can change its electrical resistance in response to a magnetic field quicker than other materials, such as graphite or bismuth, which could one day change how we store data
To uncover this, the team first applied an electric field to some graphene to equalise the number of its charge carriers, which are responsible for creating a material’s electric current. These carriers are made up of electrons, which have a negative charge, and holes, which have a positive charge.
Pristine graphene, which has no flaws to its honeycomb structure, has equal numbers of electrons and holes. Since it is difficult to produce such graphene, the researchers used an electric field to adjust the structure of flawed graphene, enabling them to research the material in a more pristine state.
Flaws in the material’s structure affect its magnetoresistance, says Geim, who won the 2010 Nobel prize in physics for his research into graphene.
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