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One-dimensional half-metallic interfaces of two-dimensional honeycomb insulators

Published version
Peer-reviewed

Type

Article

Change log

Authors

Bristowe, NC 
Stengel, M 
Littlewood, PB 
Pruneda, JM 

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.

Description

Keywords

cond-mat.mes-hall, cond-mat.mes-hall

Journal Title

Physical Review B - Condensed Matter and Materials Physics

Conference Name

Journal ISSN

1098-0121
1550-235X

Volume Title

88

Publisher

American Physical Society (APS)