Electric Polarization of Heteropolar Nanotubes as a Geometric Phase
arXiv:cond-mat/0111020 · doi:10.1103/PhysRevLett.88.056803
Abstract
The three-fold symmetry of planar boron nitride, 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 is controlled by the quantum mechanical boundary conditions on its electronic states around the tube circumference. Thus the macroscopic dipole moment has an {\it intrinsically nonlocal quantum} mechanical origin from the wrapped dimension. We formulate this novel phenomenon using the Berry's phase approach and discuss its experimental consequences.
4 pages with 3 eps figures, updated with correction to Eqn (9)
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