Under doping (bottom panel), the resonant Raman modes of the outer wall shift rigidly upwards, while the mode of the inner wall remains at the same frequency.

Using a self-consistent tight-binding model we studied the radial charge distribution in a bromine-doped double-walled carbon nanotube system. Our results confirm recent Raman measurements that most of the charge resides on the outer wall, even when the outer nanotube is semiconducting and the inner nanotube is metallic. A video presentation of this topic is available. Click on the video image to advance each frame.

Publications

• Materials Research Science and Engineering Center, National Science Foundation DMR-0213623
• Control of Nanostructures Via Metal-Carbon Interactions Over Multiple Length, National Science Foundation NIRT DMR-0103585
• Theory of novel nanostructures: symmetry and surface interactions, National Science Foundation DMR-0305035

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.