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The nonequilibrium Green's function method is used to study the ballistictransport in metallic carbon nanotubes when a current is injected from theelectrodes with finite bias voltages. We reveal, both analytically andnumerically, that large loop currents circulating around the tube are induced,which come from a quantum mechanical interference and are much larger than thecurrent along the tube axis when the injected electron is resonant with atime-reversed pair of degenerate states, which are, in fact, inherent in thezigzag and chiral nanotubes. This results in large orbital magnetic moments,making the nanotube a molecular solenoid.Comment: 5 pages, 4 figures; typos correcte

Large orbital magnetic moments in carbon nanotubes generated by resonant transport