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The spin-dependent electron transport properties of a metallic (5,5) single-walled carbon nanotube with either carbon (C) or boron (B) adatoms were investigated using a non-equilibrium Green's function technique combined with spin-dependent density functional theory. We find that both of the non-magnetic B and C adatoms cause zero-bias conductance that is highly dependent on the spin states of the conduction electrons. The microscopic origin of this phenomenon is explained by the features ofdoi:10.1380/ejssnt.2008.157 fatcat:7yawqe634bbqbnlbk64awasncu