Magnetic-field-induced robust zero Hall plateau state in MnBi(2)Te(4) Chern insulator.
Magnetic-field-induced robust zero Hall plateau state in MnBi(2)Te(4) Chern insulator.
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MNBI（2）TE（4）Chern绝缘子在MNBI中磁场诱导的稳健零霍尔高原状态。
DOI：
10.1038/s41467-021-25002-x
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发表时间：
2021-07-30
影响因子：
16.6
通讯作者：
Wang Y
中科院分区：
文献类型：
--
作者：
Liu C;Wang Y;Yang M;Mao J;Li H;Li Y;Li J;Zhu H;Wang J;Li L;Wu Y;Xu Y;Zhang J;Wang Y
本征反铁磁拓扑绝缘体MnBi_2Te_4为探索奇异拓扑量子现象提供了一个理想的平台。最近，在低磁场区，在少层MnBi_2Te_4器件中已经实现了Chern绝缘体和轴子绝缘体相。然而，MnBi_2Te_4在强磁场中的命运从未在实验中探索过。在这项工作中，我们报告的剥离MnBi2Te4薄片在脉冲磁场高达61.5 T的输运研究。在高场极限下，陈氏数C = −1的陈氏绝缘体相位演化为稳定的零霍尔电阻平台状态。非局域输运测量和理论计算表明，零霍尔平台态的电荷输运是由强磁场中的朗道能级和大塞曼效应共同作用产生的两个反向传播的边缘态进行的.我们的结果表明，复杂的相互作用之间的内在磁秩序，外部磁场，和非平凡的能带拓扑结构MnBi2Te4。反铁磁拓扑绝缘体MnBi_2Te_4在低磁场下表现出Chern相和轴子相，但在高磁场下的行为尚未得到研究。在这里，使用在高磁场下的传输测量，作者报告了由两个反向传播的边缘通道组成的零霍尔平台。
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. The antiferromagnetic topological insulator MnBi2Te4 exhibits Chern and axion insulator phases at low magnetic field; however, its behaviour in high magnetic field has remained unexplored. Here, using transport measurements at high magnetic field, the authors report a zero Hall plateau composed of two counter-propagating edge channels.
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
56.9
作者：
Koenig, Markus;Wiedmann, Steffen;Zhang, Shou-Cheng
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Zhang, Shou-Cheng
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Kresse, G;Furthmuller, J
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Furthmuller, J
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作者：
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通讯作者：
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