A spectrum of the three layer #graphene as a function of magnetic field and density of electrons. Credit: Biswajit Datta, Mandar Deshmukh Metals have a large density of electrons and to be able to see the wave nature of electrons one has to make metallic wires that are only a few atoms wide. However, in graphene - one atom thick graphite—the density of electrons is much smaller and can be changed by making a transistor. As a result of the low density of electrons the wave nature of electrons, as described by quantum mechanics, is easier to observe in graphene.
https://m.phys.org/news/2017-02-layers-graphene-reveals-kind-magnet.html
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