The effect of structural twist on electron transport in conducting carbon nanotubes is calculated using the Landauer-Buttiker formalism. A localized region of twist scatters the propagating π electrons and causes the opening of a (pseudo-) gap near the Fermi level. This opening may be reversed by applying an axial magnetic field, leading to a twist-induced, giant positive magneto-conductance in clean armchair nanotubes.
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