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One-dimensional half-metallic interfaces of two-dimensional honeycomb insulators
Authors
E Artacho
NC Bristowe
+3 more
PB Littlewood
JM Pruneda
M Stengel
Publication date
8 October 2012
Publisher
Physical Review B - Condensed Matter and Materials Physics
Doi
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on
arXiv
Abstract
We study zigzag interfaces between insulating compounds that are isostructural to graphene, specifically II-VI, III-V, and IV-IV two-dimensional 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, which in some cases are ferromagnetic half metallic. © 2013 American Physical Society
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