One-dimensional half-metallic interfaces of two-dimensional honeycomb insulators
arXiv:1210.2278 · doi:10.1103/PhysRevB.88.161411
Abstract
We study zigzag interfaces between insulating compounds that are isostructural to graphene, specifically II-VI, III-V and IV-IV two-dimensional (2D) honeycomb insulators. We show that these one-dimensional interfaces are polar, with a net density of excess charge that can be simply determined by using the ideal (integer) formal valence charges, regardless of the predominant covalent character of the bonding in these materials. We justify this finding on fundamental physical grounds, by analyzing the topology of the formal polarization lattice in the parent bulk materials. First principles calculations elucidate an electronic compensation mechanism not dissimilar to oxide interfaces, which is triggered by a Zener-like charge transfer between interfaces of opposite polarity. In particular, we predict the emergence of one dimensional electron and hole gases (1DEG), which in some cases are ferromagnetic half-metallic.
5 pages, 3 figures
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Cited by in corpus (6)
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- Emergence of one-dimensional wires of free carriers in transition-metal-dichalcogenide nanostructures
- Polar meron-antimeron networks in strained and twisted bilayers
- Engineering polar discontinuities in honeycomb lattices
- Strain-induced polar discontinuities in two-dimensional materials from combined first-principles and Schrödinger-Poisson simulations
- Modulation of magnetism via electric field in MgO nanoribbons