I have been reading in many publications that metallic SWCNTs exposed to a parallel magnetic field provide a paramagnetic susceptibility owing to the Aharnov-Bohm effect. However, I can find little information on why this effect causes such a response, beyond this statement.
From what I can understand (my background is chemistry/engineering), a metallic SWCNT (larger enough not to induce metallisation owing to curvature effects) is a zero-point semi-metal, much like graphene where linear dispersion bands meet at the K-point in Brillion space. When magnetic flux penetrates the SWCNT along the central axis the electrons experience a phase change. I am really struggling to understand how this results in a paramagnetic response, especially when the Aharnov-Bohm effect causes a periodic band gap resulting in a reduction in metalicity.
Charles Brewster You're on the right track.The Aharnov-Bohm effect in metallic SWCNTs exposed to a parallel magnetic field is a fascinating and intricate phenomenon that necessitates further research into the electronic band structure.
The phenomenon of paramagnetism in metallic SWCNTs involves magnetic field interaction, spin polarization, and density of states modulation.The Aharnov-Bohm effect generates new magnetic subbands, causing a net magnetic moment without external field. Paramagnetic response, influenced by SWCNT diameter, chirality, and magnetic field strength.
This article titled "Interactions in Single Wall Carbon Nanotubes/Pyrene/Porphyrin Nanohybrids" will be beneficial.
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