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We have used the tight-binding model to calculate the energy band of the armchair (6,6) carbon nanotubes in several different kinds of collocation including one single tube, a pair of aligned tubes, and the linear superlattice. The magneto-electronic property of these combinations of armchair (6,6) has showed a tremendous dependence on the geometric structure, the magnetic flux and the Spin-B interaction (Zeeman splitting). The pair and the linear superlattice of AB stacking can promote more overlap of the conduction and valence bands, and hence make the tubes more metallic. On the other hand, though the pair of AA stacking is more metallic than only a single tube, the superlattice of the same stacking will inherently open a tiny energy gap such as a semiconductor. When considering a uniform magnetic field applied on these systems along the tube axis direction, the magnetic flux will strongly affect the band structure of each system and show a conspicuous tendency to open or enlarge energy gap and hence bring metal into semiconductor. The spin-B interaction (Zeeman splitting) has been further included into consideration and seemed to suppress the extent of metal-semiconductor transition.

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