Large orbital magnetic moments in carbon nanotubes generated by resonant transport

Details Large orbital magnetic moments in carbon nanotubes generated by resonant transport Large orbital magnetic moments in carbon nanotubes generated by resonant transport

2006-07-25

arxiv.org/abs/cond-mat/0607629v2

Phys. Rev. B 75, 153406 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures; typos corrected

Scientific paper

10.1103/PhysRevB.75.153406

The nonequilibrium Green's function method is used to study the ballistic transport in metallic carbon nanotubes when a current is injected from the electrodes with finite bias voltages. We reveal, both analytically and numerically, that large loop currents circulating around the tube are induced, which come from a quantum mechanical interference and are much larger than the current along the tube axis when the injected electron is resonant with a time-reversed pair of degenerate states, which are, in fact, inherent in the zigzag and chiral nanotubes. This results in large orbital magnetic moments, making the nanotube a molecular solenoid.

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