The existence of a large induced magnetic moment in defected single-walled carbon nanotubes (SWCNTs) is predicted using the Green's function method. Specific to this magnetic moment of defected SWCNT is its magnitude, which is much larger (by several orders of magnitude) than that of perfect SWCNTs. The induced magnetic moment also shows certain remarkable features. Therefore, we suggest that two pair-defect orientations in SWCNTs can be distinguished in experiment through the direction of the induced magnetic moment at some specific energy points.
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