Hybrid quantum anomalous Hall effect at graphene-oxide interfaces
Zanolli, Zeila (Institut Català de Nanociència i Nanotecnologia)
Niu, C. (Peter Grünberg Institut)
Bihlmayer, G. (Peter Grünberg Institut)
Mokrousov, Y. (Johannes Gutenberg University Mainz)
Mavropoulos, Phivos (Peter Grünberg Institut)
Verstraete, Matthieu J. (Université de Liège)
Blügel, Stefan (Peter Grünberg Institut)

Date:	2018
Abstract:	Interfaces are ubiquitous in materials science, and in devices in particular. As device dimensions are constantly shrinking, understanding the physical properties emerging at interfaces is crucial to exploit them for applications, here for spintronics. Using first-principles techniques and Monte Carlo simulations, we investigate the mutual magnetic interaction at the interface between graphene and an antiferromagnetic semiconductor BaMnO3. We find that graphene deeply affects the magnetic state of the substrate, down to several layers below the interface, by inducing an overall magnetic softening, and switching the in-plane magnetic ordering from antiferromagnetic to ferromagnetic. The graphene-BaMnO3 system presents a Rashba gap 300 times larger than in pristine graphene, leading to a flavor of quantum anomalous Hall effect (QAHE), a hybrid QAHE, characterized by the coexistence of metallic and topological insulating states. These findings could be exploited to fabricate devices that use graphene to control the magnetic configuration of a substrate.
Grants:	Ministerio de Economía y Competitividad RYC-2016-19344 European Commission 676598 Ministerio de Economía y Competitividad FIS2015-64886-C5-3-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1506 Ministerio de Economía y Competitividad SEV-2013-0295 European Commission 653838
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Spintronics ; Topological insulators
Published in:	Physical review B, Vol. 98, Issue 15 (October 2018) , art. 155404, ISSN 2469-9969

DOI: 10.1103/PhysRevB.98.155404

Preprint 14 p, 5.9 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles