Superparamagnetism-induced mesoscopic electron focusing in topological insulators

et al.

Detalles Bibliográficos
Autores: Sessi, Paolo, Valbuena, Miguel A., Godey, Sylvie, Mugarza, Aitor
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/159933
Acceso en línea:http://hdl.handle.net/10261/159933
Access Level:acceso abierto
Palabra clave:ddc:530
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spelling Superparamagnetism-induced mesoscopic electron focusing in topological insulatorsSessi, PaoloValbuena, Miguel A.Godey, SylvieMugarza, Aitorddc:530et al.Recently it has been shown that surface magnetic doping of topological insulators induces backscattering of Dirac states which are usually protected by time-reversal symmetry [Sessi, Nat. Commun. 5, 5349 (2014)10.1038/ncomms6349]. Here we report on quasiparticle interference measurements where, by improved Fermi level tuning, strongly focused interference patterns on surface Mn-doped Bi2Te3 could be directly observed by means of scanning tunneling microscopy at 4 K. Ab initio and model calculations reveal that their mesoscopic coherence relies on two prerequisites: (i) a hexagonal Fermi surface with large parallel segments (nesting) and (ii) magnetic dopants which couple to a high-spin state. Indeed, x-ray magnetic circular dichroism shows superparamagnetism even at very dilute Mn concentrations. Our findings provide evidence of strongly anisotropic Dirac-fermion-mediated interactions and demonstrate how spin information can be transmitted over long distances, allowing the design of experiments and devices based on coherent quantum effects in topological insulators.This work was performed within the DFG-funded SPP 1666 (Projects No. BO 1468/21-1 and No. MA 4637/3-1). P.R., N.H.L., P.M., and S.B. acknowledge financial support from the VITI project of the Helmholtz Association as well as computational support from the JARA-HPC Supercomputing Centre at RWTH Aachen. M.B. acknowledges supported through SFB 1170 “ToCoTronics” (Project No. A02). The work was partially supported by the Italian Government (MIUR Progetto Premiale “Materiali e disposivi magnetici e superconduttivi per sensoristica e ICT”). M.A.V., S.G., and A.M. acknowledge support from the Ministerio de Ciencia e Innovacion (Grant No. MAT2013-46593-C6-5-P), the Severo Ochoa Program (MINECO, Grant No. SEV-2013-0295), and Agencia de Gestio d’Ajuts Universitaris i de Recerca (Grant No. 2014 SGR715).Peer ReviewedAmerican Physical SocietyMinistero dell'Istruzione, dell'Università e della RicercaHelmholtz AssociationGerman Research FoundationMinisterio de Ciencia e Innovación (España)Generalitat de CatalunyaMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2018201820162018info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/159933reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2013-0295info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-46593-C6-5-Phttp://dx.doi.org/10.1103/PhysRevB.94.075137Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1599332026-05-22T06:33:51Z
dc.title.none.fl_str_mv Superparamagnetism-induced mesoscopic electron focusing in topological insulators
title Superparamagnetism-induced mesoscopic electron focusing in topological insulators
spellingShingle Superparamagnetism-induced mesoscopic electron focusing in topological insulators
Sessi, Paolo
ddc:530
title_short Superparamagnetism-induced mesoscopic electron focusing in topological insulators
title_full Superparamagnetism-induced mesoscopic electron focusing in topological insulators
title_fullStr Superparamagnetism-induced mesoscopic electron focusing in topological insulators
title_full_unstemmed Superparamagnetism-induced mesoscopic electron focusing in topological insulators
title_sort Superparamagnetism-induced mesoscopic electron focusing in topological insulators
dc.creator.none.fl_str_mv Sessi, Paolo
Valbuena, Miguel A.
Godey, Sylvie
Mugarza, Aitor
author Sessi, Paolo
author_facet Sessi, Paolo
Valbuena, Miguel A.
Godey, Sylvie
Mugarza, Aitor
author_role author
author2 Valbuena, Miguel A.
Godey, Sylvie
Mugarza, Aitor
author2_role author
author
author
dc.contributor.none.fl_str_mv Ministero dell'Istruzione, dell'Università e della Ricerca
Helmholtz Association
German Research Foundation
Ministerio de Ciencia e Innovación (España)
Generalitat de Catalunya
Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv ddc:530
topic ddc:530
description et al.
publishDate 2016
dc.date.none.fl_str_mv 2016
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/159933
url http://hdl.handle.net/10261/159933
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2013-0295
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-46593-C6-5-P
http://dx.doi.org/10.1103/PhysRevB.94.075137
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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