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Using an approach different from the conventional vapor doping methods, Cs positive ions in a magnetizedplasma column are irradiated upon a negatively biased substrate which is covered with dispersed single-walled carbon nanotubes ͑SWNTs͒. The Cs ions are evidently observed inside SWNTs by the Z-contrast method in scanning transmission electron microscopy, demonstrating the formation of alkali-metal encapsulating SWNTs. Ab initio band structures and density of states for the light and heavydoi:10.1103/physrevb.68.075410 fatcat:tkjcet6u7jay3avwwpyw7xofyi