Large orbital magnetic moments in carbon nanotubes generated by resonant transport
arXiv:cond-mat/0607629 · doi:10.1103/PhysRevB.75.153406
Abstract
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.
arXiv comment5 pages, 4 figures; typos corrected
References in corpus (4)
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