Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators

Presently, the unusual quantum phenomena recently discovered in intrinsic antiferromagnetic topological insulators are far from being fully understood. Motivated by recent controversial ARPES results on the MnBi2Te4 family compounds, we theoretically study the underlying physics of spectral properti...

Descripción completa

Detalles Bibliográficos
Autores: Men'shov, V. N., Shvets, Igor A., Chulkov, Eugene V.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/306303
Acceso en línea:http://hdl.handle.net/10261/306303
Access Level:acceso abierto
id ES_824aa1c1922ebf2dbdc91919bad7090e
oai_identifier_str oai:digital.csic.es:10261/306303
network_acronym_str ES
network_name_str España
repository_id_str
spelling Towards comprehension of the surface state properties in the intrinsic magnetic topological insulatorsMen'shov, V. N.Shvets, Igor A.Chulkov, Eugene V.Presently, the unusual quantum phenomena recently discovered in intrinsic antiferromagnetic topological insulators are far from being fully understood. Motivated by recent controversial ARPES results on the MnBi2Te4 family compounds, we theoretically study the underlying physics of spectral properties of such materials. By using a continual model, we address the issue of the topological surface fermions which simultaneously experience an exchange field of a regular antiferromagnetic alignment and a surface electrostatic potential. The emergent net exchange field acting on the surface state is shown to depend on the surface potential strength, of which variation could be associated with concentration fluctuations of antisite and other defects that are inevitably present in MnBi2Te4 material. In this scenario, we discuss the possible microscopic mechanism for change of both size and sign of the surface exchange gap from sample to sample. Furthermore, we provide a natural explanation for the appearance of a finite density of states inside the exchange gap in the case of strong fluctuations in the surface potential. Thus, our results allow for a unified interpretation of various spectroscopic measurements on intrinsic antiferromagnetic topological insulators.E.V.C. acknowledges support from Saint Petersburg State University (Project ID No. 90383050). I.A.S. and V.N.M. acknowledge support from Russian Science Foundation within Research Project No. 18-12-00169-p.Peer reviewedAmerican Physical SocietySaint Petersburg State UniversityRussian Science FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/306303reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésPhysical Review Bhttps://doi.org/10.1103/PhysRevB.106.205301Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3063032026-05-22T06:33:51Z
dc.title.none.fl_str_mv Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
title Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
spellingShingle Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
Men'shov, V. N.
title_short Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
title_full Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
title_fullStr Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
title_full_unstemmed Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
title_sort Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
dc.creator.none.fl_str_mv Men'shov, V. N.
Shvets, Igor A.
Chulkov, Eugene V.
author Men'shov, V. N.
author_facet Men'shov, V. N.
Shvets, Igor A.
Chulkov, Eugene V.
author_role author
author2 Shvets, Igor A.
Chulkov, Eugene V.
author2_role author
author
dc.contributor.none.fl_str_mv Saint Petersburg State University
Russian Science Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description Presently, the unusual quantum phenomena recently discovered in intrinsic antiferromagnetic topological insulators are far from being fully understood. Motivated by recent controversial ARPES results on the MnBi2Te4 family compounds, we theoretically study the underlying physics of spectral properties of such materials. By using a continual model, we address the issue of the topological surface fermions which simultaneously experience an exchange field of a regular antiferromagnetic alignment and a surface electrostatic potential. The emergent net exchange field acting on the surface state is shown to depend on the surface potential strength, of which variation could be associated with concentration fluctuations of antisite and other defects that are inevitably present in MnBi2Te4 material. In this scenario, we discuss the possible microscopic mechanism for change of both size and sign of the surface exchange gap from sample to sample. Furthermore, we provide a natural explanation for the appearance of a finite density of states inside the exchange gap in the case of strong fluctuations in the surface potential. Thus, our results allow for a unified interpretation of various spectroscopic measurements on intrinsic antiferromagnetic topological insulators.
publishDate 2022
dc.date.none.fl_str_mv 2022
2023
2023
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/10261/306303
url http://hdl.handle.net/10261/306303
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Physical Review B
https://doi.org/10.1103/PhysRevB.106.205301
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869412035722215424
score 15.812429

Similares en LA Referencia