Electric Polarization of Heteropolar Nanotubes as a Geometric Phase
Electric Polarization of Heteropolar Nanotubes as a Geometric Phase
The threefold symmetry of planar boron nitride (BN), the III-V analog to graphene, prohibits an electric polarization in its ground state, but this symmetry is broken when the sheet is wrapped to form a BN nanotube. We show that this leads to an electric polarization along the nanotube axis which …