| Autor: |
Li, Yaoxin, Wang, Yongchao, Lian, Zichen, Li, Hao, Gao, Zhiting, Xu, Liangcai, Wang, Huan, Lu, Rui'e, Li, Longfei, Feng, Yang, Zhu, Jinjiang, Liu, Liangyang, Wang, Yongqian, Fu, Bohan, Yang, Shuai, Yang, Luyi, Wang, Yihua, Xia, Tianlong, Liu, Chang, Jia, Shuang |
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| Zdroj: |
Nature Communications; 4/22/2024, Vol. 15 Issue 1, p1-9, 9p |
| Abstrakt: |
The van der Waals antiferromagnetic topological insulator MnBi2Te4 represents a promising platform for exploring the layer-dependent magnetism and topological states of matter. Recently observed discrepancies between magnetic and transport properties have aroused controversies concerning the topological nature of MnBi2Te4 in the ground state. In this article, we demonstrate that fabrication can induce mismatched even-odd layer dependent magnetotransport in few-layer MnBi2Te4. We perform a comprehensive study of the magnetotransport properties in 6- and 7-septuple-layer MnBi2Te4, and reveal that both even- and odd-number-layer device can show zero Hall plateau phenomena in zero magnetic field. Importantly, a statistical survey of the optical contrast in more than 200 MnBi2Te4 flakes reveals that the zero Hall plateau in odd-number-layer devices arises from the reduction of the effective thickness during the fabrication, a factor that was rarely noticed in previous studies of 2D materials. Our finding not only provides an explanation to the controversies regarding the discrepancy of the even-odd layer dependent magnetotransport in MnBi2Te4, but also highlights the critical issues concerning the fabrication and characterization of 2D material devices. MnBi2Te4 is an antiferromagnetic topological insulator. This combination of magnetic ordering and topological properties has resulted in intense interest, however, like many van der Waals materials, experimental results are hampered by fabrication difficulties. Here, Li, Wang, Lian et al. show that the fabrication process itself can result in mismatched thickness dependence of magneto-transport measurements. ' [ABSTRACT FROM AUTHOR] |
| Databáze: |
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