Molecular Approach for Engineering Interfacial Interactions in Magnetic/Topological Insulator Heterostructures
González Cuxart, Marc (Institut Català de Nanociència i Nanotecnologia)
Valbuena, Miguel Ángel (Institut Català de Nanociència i Nanotecnologia)
Robles, Roberto (Centro de Física de Materiales (CSIC-UPV/EHU))
Moreno, Cesar (Institut Català de Nanociència i Nanotecnologia)
Bonell, Frédéric (Institut Català de Nanociència i Nanotecnologia)
Sauthier, Guillaume (Institut Català de Nanociència i Nanotecnologia)
Imaz, Inhar (Institut Català de Nanociència i Nanotecnologia)
Xu, Heng (Institut Català de Nanociència i Nanotecnologia)
Nistor, Corneliu (ETH Zurich. Department of Materials)
Barla, Alessandro (Istituto di Struttura della Materia)
Gargiani, Pierluigi (ALBA Laboratori de Llum de Sincrotró)
Valvidares, Manuel (ALBA Laboratori de Llum de Sincrotró)
Maspoch Comamala, Daniel (Institut Català de Nanociència i Nanotecnologia)
Gambardella, Pietro (ETH Zurich. Department of Materials)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia)

Additional title:	A Molecular Approach for Engineering Interfacial Interactions in Magnetic-Topological Insulator Heterostructures
Date:	2020
Abstract:	Controlling interfacial interactions in magnetic/topological insulator heterostructures is a major challenge for the emergence of novel spin-dependent electronic phenomena. As for any rational design of heterostructures that rely on proximity effects, one should ideally retain the overall properties of each component while tuning interactions at the interface. However, in most inorganic interfaces, interactions are too strong, consequently perturbing, and even quenching, both the magnetic moment and the topological surface states at each side of the interface. Here, we show that these properties can be preserved using ligand chemistry to tune the interaction of magnetic ions with the surface states. By depositing Co-based porphyrin and phthalocyanine monolayers on the surface of BiTe thin films, robust interfaces are formed that preserve undoped topological surface states as well as the pristine magnetic moment of the divalent Co ions. The selected ligands allow us to tune the interfacial hybridization within this weak interaction regime. These results, which are in stark contrast with the observed suppression of the surface state at the first quintuple layer of BiSe induced by the interaction with Co phthalocyanines, demonstrate the capability of planar metal-organic molecules to span interactions from the strong to the weak limit.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-827 Ministerio de Economía y Competitividad MAT2016-78293-C6-2-R Ministerio de Economía y Competitividad MAT2016-75952-R Ministerio de Economía y Competitividad RTI2018-095622-B-I00 Ministerio de Economía y Competitividad SEV-2017-0706 European Commission 766864 European Commission 824140 European Commission 306652
Note:	Altres ajuts: Interreg V-A España-Francia-Andorra (EFA 194/16 TNSI)
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Published in:	ACS nano, Vol. 14, Issue 5 (May 2020) , p. 6285-6294, ISSN 1936-086X

DOI: 10.1021/acsnano.0c02498

Postprint 18 p, 5.2 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles