| Autor: |
Klimovskikh, I. I., Otrokov, M. M., Estyunin, D., Eremeev, S. V., Filnov, S. O., Koroleva, A., Shevchenko, E., Voroshnin, V., Rusinov, I. P., Blanco-Rey, M., Hoffmann, M., Aliev, Z. S., Babanly, M. B., Amiraslanov, I. R., Abdullayev, N. A., Zverev, V. N., Kimura, A., Tereshchenko, O. E., Kokh, K. A., Petaccia, L., Di Santo, G., Ernst, A., Echenique, P. M., Mamedov, N. T., Shikin, A. M., Chulkov, E. V. |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
npj Quantum Mater. 5, 54 (2020) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1038/s41535-020-00255-9 |
| Popis: |
Quantum states of matter combining non-trivial topology and magnetism attract a lot of attention nowadays; the special focus is on magnetic topological insulators (MTIs) featuring quantum anomalous Hall and axion insulator phases. Feasibility of many novel phenomena that \emph{intrinsic} magnetic TIs may host depends crucially on our ability to engineer and efficiently tune their electronic and magnetic structures. Here, using angle- and spin-resolved photoemission spectroscopy along with \emph{ab initio} calculations we report on a large family of intrinsic magnetic TIs in the homologous series of the van der Waals compounds (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_m$ with $m=0, ..., 6$. Magnetic, electronic and, consequently, topological properties of these materials depend strongly on the $m$ value and are thus highly tunable. The antiferromagnetic (AFM) coupling between the neighboring Mn layers strongly weakens on moving from MnBi2Te4 (m=0) to MnBi4Te7 (m=1), changes to ferromagnetic (FM) one in MnBi6Te10 (m=2) and disappears with further increase in m. In this way, the AFM and FM TI states are respectively realized in the $m=0,1$ and $m=2$ cases, while for $m \ge 3$ a novel and hitherto-unknown topologically-nontrivial phase arises, in which below the corresponding critical temperature the magnetizations of the non-interacting 2D ferromagnets, formed by the \MBT\, building blocks, are disordered along the third direction. The variety of intrinsic magnetic TI phases in (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_m$ allows efficient engineering of functional van der Waals heterostructures for topological quantum computation, as well as antiferromagnetic and 2D spintronics. |
| Databáze: |
arXiv |
| Externí odkaz: |
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