Probing magnetism in atomically thin semiconducting PtSe(2).
Probing magnetism in atomically thin semiconducting PtSe(2).
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DOI：
10.1038/s41467-020-18521-6
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发表时间：
2020-09-23
影响因子：
16.6
通讯作者：
Kis A
中科院分区：
文献类型：
--
作者：
Avsar A;Cheon CY;Pizzochero M;Tripathi M;Ciarrocchi A;Yazyev OV;Kis A
二维过渡金属二硫族化合物的原子尺度无序性通常伴随着局部磁矩，这可能会导致本质上非磁性材料的远程磁有序。在这里，我们通过在横向和纵向测量配置下进行磁电阻测量，证明了有缺陷的单层和双层半导体PtSe2的远程磁有序特征。当材料从双层厚度减薄到单层厚度时，我们观察到铁磁性到反铁磁性的交叉，这种行为与在原型二维磁体CrI3中观察到的行为相反。我们的第一线原理计算，由点缺陷的像差校正透射电子显微镜成像支持，将这种转变与PtSe2中缺陷诱导磁性和层间相互作用之间的相互作用联系起来。此外，我们表明石墨烯可以有效地用于探测相邻半导体PtSe2的磁化。我们在最终缩放单层系统中的发现为在非磁性二维材料中进行原子对原子的磁性工程奠定了基础。受益缺陷可用于将磁性引入非本质磁性的材料中。在这里，作者通过使用近似石墨烯作为探针，证明了在空气稳定、有缺陷的铂二硒化物的最终厚度极限下的长距离磁有序。
Atomic-scale disorder in two-dimensional transition metal dichalcogenides is often accompanied by local magnetic moments, which can conceivably induce long-range magnetic ordering into intrinsically non-magnetic materials. Here, we demonstrate the signature of long-range magnetic orderings in defective mono- and bi-layer semiconducting PtSe2 by performing magnetoresistance measurements under both lateral and vertical measurement configurations. As the material is thinned down from bi- to mono-layer thickness, we observe a ferromagnetic-to-antiferromagnetic crossover, a behavior which is opposite to the one observed in the prototypical 2D magnet CrI3. Our first-principles calculations, supported by aberration-corrected transmission electron microscopy imaging of point defects, associate this transition to the interplay between the defect-induced magnetism and the interlayer interactions in PtSe2. Furthermore, we show that graphene can be effectively used to probe the magnetization of adjacent semiconducting PtSe2. Our findings in an ultimately scaled monolayer system lay the foundation for atom-by-atom engineering of magnetism in otherwise non-magnetic 2D materials. Beneficiary defects could be utilized to introduce magnetism into materials that are not intrinsically magnetic. Here, the authors demonstrate long range magnetic order in the air-stable, defective Platinum Diselenide in the ultimate limit of thickness by using proximitized graphene as a probe.
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通讯作者：
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