Toroidal Carbon Nanotubes with Encapsulated Atomic Metal Loops

Details Toroidal Carbon Nanotubes with Encapsulated Atomic Metal Loops Toroidal Carbon Nanotubes with Encapsulated Atomic Metal Loops

2010-09-02

arxiv.org/abs/1009.0442v1

Phys. Rev. B 76, 125422 (2007)

Physics

Condensed Matter

Materials Science

6 pages, 9 figures

Scientific paper

10.1103/PhysRevB.76.125422

Toroidal carbon nanotubes can serve as hosts for encapsulated loops of atomic metal wires. Such composite structures have been analyzed using density functional theory for a semiconducting C$_{120}$ torus encapsulating chains of Fe, Au and Cu atoms. The sheathed metal necklaces form a zigzag structure and drops the HOMO/LUMO bandgap to less than 0.1 eV. The iron composite is ferromagnetic with a magnetic moment essentially the same as that of bcc iron. The azimuthal symmetry of these toroidal composites suggests that they may offer novel elecromagnetic properties not associated with straight, metal-encapsulated carbon nanotubes.

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