论文标题
磁场引起的稳健零霍尔高原州在MNBI $ _2 $ TE $ _4 $ CHERN绝缘子
Magnetic-field-induced robust zero Hall plateau state in MnBi$_2$Te$_4$ Chern insulator
论文作者
论文摘要
固有的抗铁磁拓扑绝缘子MNBI2TE4为探索外来拓扑量子现象提供了理想的平台。最近，在低磁场状态下的几层MNBI2TE4设备中已经实现了Chern绝缘体和轴突绝缘子相。但是，在实验中从未探索过高磁场中MNBI2TE4的命运。在这项工作中，我们报告了在高达61.5 t的脉冲磁场中剥落的MNBI2TE4薄片的运输研究。在高场极限下，Chern绝缘子相具有Chern数字C = -1的Chern绝缘体阶段，将其演变为强大的零厅电阻型高原状态。非局部运输测量和理论计算表明，零霍尔高原状态的电荷运输是由两个反向传播的边缘状态进行的，这些状态来自兰道水平的综合效应和强Zeeman在强磁场中的巨大效应。我们的结果证明了MNBI2TE4中的固有磁性阶，外部磁场和非平凡带拓扑之间的复杂相互作用。
The intrinsic antiferromagnetic topological insulator MnBi2Te4 provides an ideal platform for exploring exotic topological quantum phenomena. Recently, the Chern insulator and axion insulator phases have been realized in few-layer MnBi2Te4 devices at low magnetic field regime. However, the fate of MnBi2Te4 in high magnetic field has never been explored in experiment. In this work, we report transport studies of exfoliated MnBi2Te4 flakes in pulsed magnetic fields up to 61.5 T. In the high-field limit, the Chern insulator phase with Chern number C = -1 evolves into a robust zero Hall resistance plateau state. Nonlocal transport measurements and theoretical calculations demonstrate that the charge transport in the zero Hall plateau state is conducted by two counter-propagating edge states that arise from the combined effects of Landau levels and large Zeeman effect in strong magnetic fields. Our result demonstrates the intricate interplay among intrinsic magnetic order, external magnetic field, and nontrivial band topology in MnBi2Te4.
