MnBi2Te4 – a good platform for topological quantum physics study

MnBi2Te4 – a good platform for topological quantum physics study
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MnBi2Te4 — 拓扑量子物理研究的良好平台

DOI:
10.1007/s44214-022-00018-6
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发表时间:
2022-11
期刊:
Quantum Frontiers
影响因子:
--
通讯作者:
Jin-Feng Jia
Jin-Feng Jia
中科院分区:
其他
文献类型:
--
作者:
Weilun Tan;Jing Liu;Hui Li;D;an Guan;Jin-Feng Jia

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摘要磁性拓扑绝缘体MnBi2Te4是一种本征范德华层结构化合物。磁性和拓扑的相互作用使MnBi2Te4成为研究可控拓扑相变和量子反常霍尔态和Weyl半金属相等新兴物理态的良好平台。晶体表征为由Te-Bi-Te-Mn-Te-Bi-Te七层(SL)反铁磁耦合组成的菱形晶胞。用角度分辨光发射光谱系统地研究了MnBi2Te4晶体的表面态,用输运测量了块体态,得到了MnBi2Te4晶体的详细电子结构。MnBi2Te4中观察到丰富的拓扑相。温度、掺杂和外加磁场都会影响不同的拓扑相,并在一定条件下诱发相变。在5-SLs MnBi2Te4薄片中,在高达6.5K的温度下实现了量子反常霍尔效应(QAHE)。此外,MnBi2Te4的负向正磁阻转变和厚度相关的QAHE chen数为该材料的Weyl半金属态提供了强有力的证据。基于2019年至2022年的实验,我们的回顾应该为MnBi2Te4化合物未来的研究机会提供启示。
AbstractMagnetic topological insulator MnBi2Te4 is an intrinsic van der Waals layer structure compound. The interplay between magnetism and topology makes MnBi2Te4 a good platform to investigate controllable topological phase transition and emerging physical states such as quantum anomalous Hall state and Weyl semimetal phase. Crystal characterization showed a rhombohedral unit cell composing of Te-Bi-Te-Mn-Te-Bi-Te septuple layer (SL) coupled antiferromagnetically. Systematically investigation of surface states with angle-resolved photoemission spectroscopy and of bulk states with transport measurement showed detailed electronic structure of MnBi2Te4 crystal. Rich topological phases were observed in MnBi2Te4. Temperature, doping and external magnetic field could affect the different topological phases and induce phase transitions in certain conditions. Quantum anomalous Hall effect (QAHE) was realized at as high as 6.5K in 5-SLs MnBi2Te4 flake. Furthermore, the negative to positive magnetoresistance transition and the thickness dependent QAHE Chern number of MnBi2Te4 provide strong evidences for the Weyl semimetal states in this material. Based on experiments done from 2019 to 2022, our review should shed light on future research opportunities on MnBi2Te4 compound.
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