| Autor: |
Marius Scholten, Jorge I. Facio, Rajyavardhan Ray, Ilya M. Eremin, Jeroen van den Brink, Flavio S. Nogueira |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 3, Iss 3, p L032014 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.3.L032014 |
| Popis: |
We derive an effective field theory model for magnetic topological insulators and predict that a magnetic electronic gap persists on the surface for temperatures above the ordering temperature of the bulk. Our analysis also applies to interfaces of heterostructures consisting of a ferromagnetic and a topological insulator. In order to make quantitative predictions for MnBi_{2}Te_{4} and for EuS-Bi_{2}Se_{3} heterostructures, we combine the effective field theory method with density functional theory and Monte Carlo simulations. For MnBi_{2}Te_{4} we predict an upwards Néel temperature shift at the surface up to 15%, while the EuS-Bi_{2}Se_{3} interface exhibits a smaller relative shift. The effective theory also predicts induced Dzyaloshinskii-Moriya interactions and a topological magnetoelectric effect, both of which feature a finite temperature and chemical potential dependence. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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