The magnetic current flux induced in various types of carbon nanotori is studied and the paramagnetic and diamagnetic properties of carbon systems are explained as a function of electronic-band filling. By adding electrons or holes into the carbon structure it is possible to alter the band-filling configuration, thus modifying the magnetic response. When the electronic gap of these systems approaches zero, the local ring currents (either diamagnetic or paramagnetic, see image) are enhanced.
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