Abstract
The unusual band structure of carbon nanotubes (CNs) results in their remarkable magnetic properties. The application of magnetic field parallel to the tube axis can change the conducting properties of the CN from metallic to semiconducting and vice versa. Apart from that, B induces (via the Bohm-Aharonov effect) orbital magnetic moments in the nanotube. These moments are studied both in pure and hole- or electron-doped CNs, isolated or in a circuit. Remarkably, in pure CNs depend uniquely on their original conducting properties, length, and temperature but do not depend on the nanotube radius or the particular chirality. In doped nanotubes the magnetic moments can be strongly altered and depend on the radius and chirality. Temperature can even change their character from diamagnetic at low to paramagnetic at high . A general electron-hole asymmetry increasing with the doping is found.
4 More- Received 8 February 2005
DOI:https://doi.org/10.1103/PhysRevB.72.115406
©2005 American Physical Society