title: Colossal paramagnetic moments in metallic carbon nanotori.
abstract: Carbon nanostructures with unusually large paramagnetic moments have been discovered in a theoretical study of the electronic and magnetic properties of carbon nanotubes bent into toroids. Specifically, nanotori formed from metallic nanotubes with lambda(F) = 3T, where lambda(F) is the Fermi wavelength and T the translation vector of the nanotube, exhibit giant paramagnetic moments at selected radii ("magic radii"), while the ones with lambda(F) = T are paramagnetic at any radius. The large paramagnetic moment is due to the interplay between the toroidal geometry and the ballistic motion of the pi electrons in the metallic nanotube.
authors.affiliation: Department of Physics, University of Louisville, Louisville, Kentucky 40292, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
authors.forename: G Y
authors.initials: GY
authors.lastname: Guo
authors.forename: C S
authors.initials: CS
authors.lastname: Jayanthi
authors.forename: S Y
authors.initials: SY
authors.lastname: Wu