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

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Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators. / Меньшов, Владимир Николаевич ; Швец, Игорь Анатольевич; Чулков, Евгений Владимирович.

в: Physical Review B, Том 106, № 20, 205301 , 15.11.2022.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

BibTeX

@article{23b32167d6114edcb8e7612ae677e66c,

title = "Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators",

abstract = "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.",

author = "Меньшов, {Владимир Николаевич} and Швец, {Игорь Анатольевич} and Чулков, {Евгений Владимирович}",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = nov,

day = "15",

doi = "10.1103/physrevb.106.205301",

language = "English",

volume = "106",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "20",

}

RIS

TY - JOUR

T1 - Towards comprehension of the surface state properties in the intrinsic magnetic topological insulators

AU - Меньшов, Владимир Николаевич

AU - Швец, Игорь Анатольевич

AU - Чулков, Евгений Владимирович

PY - 2022/11/15

Y1 - 2022/11/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85141913224&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/7980adaf-eb31-3899-bbe8-1179f5108774/

U2 - 10.1103/physrevb.106.205301

DO - 10.1103/physrevb.106.205301

M3 - Article

VL - 106

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 20

M1 - 205301

ER -

ID: 100335429