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Chulkov, Evgueni V.
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DOI Доступ к ресурсу на сайте издателя
10.1103/PhysRevB.106.205301
Title
Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
Creator
Menshov, V. N.
Creator
Shvets, I. A.
Creator
Chulkov, Evgueni V.
Subject
собственные магнитные топологические изоляторы
поверхностные состояния
топологические поверхностные состояния фермионов
Date
2022
DOI
10.1103/PhysRevB.106.205301
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. © 2022 American Physical Society.
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Научное управление
Identifier
koha:001008659
https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001008659
Type
статьи в журналах
Source
Physical Review B. 2022. Vol. 106, № 20. P. 205301-1-205301-13
Language
eng
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Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators
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