For the first time, scientists created a tunable artificial atom in graphene. They demonstrated that a vacancy in graphene can be charged in a controllable way such that electrons can be localized to mimic the electron orbitals of an artificial atom. Importantly, the trapping mechanism is reversible (turned on and off) and the energy levels can be tuned.

Via:: https://phys.org/news/2017-04-electrons-graphene-path-potential-electronic.html

Controlling electrons in graphene opens a new path to potential electronic devices

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