Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator [Formula: see text].
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
06 Aug 2020
06 Aug 2020
Historique:
received:
03
04
2020
accepted:
22
07
2020
entrez:
9
8
2020
pubmed:
9
8
2020
medline:
9
8
2020
Statut:
epublish
Résumé
Modification of the gap at the Dirac point (DP) in axion antiferromagnetic topological insulator [Formula: see text] and its electronic and spin structure have been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation at various temperatures (9-35 K), light polarizations and photon energies. We have distinguished both large (60-70 meV) and reduced ([Formula: see text]) gaps at the DP in the ARPES dispersions, which remain open above the Neél temperature ([Formula: see text]). We propose that the gap above [Formula: see text] remains open due to a short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for the "large gap" sample and apparently significantly reduced effective magnetic moment for the "reduced gap" sample. These observations can be explained by a shift of the Dirac cone (DC) state localization towards the second Mn layer due to structural disturbance and surface relaxation effects, where DC state is influenced by compensated opposite magnetic moments. As we have shown by means of ab-initio calculations surface structural modification can result in a significant modulation of the DP gap.
Identifiants
pubmed: 32764583
doi: 10.1038/s41598-020-70089-9
pii: 10.1038/s41598-020-70089-9
pmc: PMC7413556
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13226Subventions
Organisme : Saint Petersburg State University
ID : 40990069
Organisme : Russian Science Foundation
ID : 18-12-00062
Organisme : Russian Science Foundation
ID : 18-12-00169
Organisme : Russian Foundation for Basic Research
ID : 20-32-70179
Organisme : KAKENHI
ID : 17H06138
Organisme : Science Development Foundation under the President of the Republic of Azerbaijan
ID : EI F-BGM-4-RFTF1/2017-21/04/1-M-02
Organisme : Fundamental Research Program of the State Academies of Sciences
ID : III.23.2.9
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