Persistent currents in carbon nanotubes

Details Persistent currents in carbon nanotubes Persistent currents in carbon nanotubes

2002-05-09

arxiv.org/abs/cond-mat/0205184v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 text pages, 6 figures, to appear in Physics Letters A

Scientific paper

10.1016/S0375-9601(02)00723-5

Persistent currents driven by a static magnetic flux parallel to the carbon nanotube axis are investigated. Owing to the hexagonal symmetry of graphene the Fermi contour expected for a 2D-lattice reduces to two points. However the electron or hole doping shifts the Fermi energy upwards or downwards and as a result, the shape of the Fermi surface changes. Such a hole doping leading to the Fermi level shift of (more or less) 1eV has been recently observed experimentally. In this paper we show that the shift of the Fermi energy changes dramatically the persistent currents and discuss the electronic structure and possible currents for zigzag as well as armchair nanotubes.

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