层状二硒化铂中缺陷诱导的$4p$磁性
Defect-induced $4p$-magnetism in layered platinum diselenide
摘要：
二硒化铂（PtSe $_{2}$）是近年来发现的一种非本征磁体，其磁性来源于Pt空位的存在。这些缺陷的主体材料本身显示出有趣的结构和电子特性，其中一些源于其层之间的异常强相互作用。迄今为止，尚不清楚PtSe $_2$的独特固有性质将如何影响其感生磁性。在这项理论工作中，我们表明，在PtSe $_{2}$薄膜中的缺陷引起的磁性是高度敏感的：（i）层的厚度（ii）缺陷密度，和（iii）衬底的选择。这些不同的因素极大地改变了所有的磁性，包括局部磁矩的大小，耦合的强度，甚至磁矩之间耦合的性质。我们进一步表明，强烈的层间相互作用是理解这些效应的关键。更好地理解对磁性的各种影响，可以使基于Pt的二硫属化物的磁性能的可控调谐成为可能，这可以用于设计用于磁电和磁光应用的新型器件。
英文摘要：
Platinum diselenide (PtSe$_{2}$) is a recently-discovered extrinsic magnet, with its magnetism attributed to the presence of Pt-vacancies. The host material to these defects itself displays interesting structural and electronic properties, some of which stem from an unusually strong interaction between its layers. To date, it is not clear how the unique intrinsic properties of PtSe$_2$ will affect its induced magnetism. In this theoretical work, we show that the defect-induced magnetism in PtSe$_{2}$ thin films is highly sensitive to: (i) the layer-thickness (ii) defect density, and (iii) substrate choice. These different factors dramatically modify all magnetic properties, including the magnitude of local moments, strength of the coupling, and even nature of the coupling between the moments. We further show that the strong inter-layer interactions are key to understanding these effects. A better understanding of the various influences on magnetism, can enable controllable tuning of the magnetic properties in Pt-based dichalcogenides, which can be used to design novel devices for magnetoelectric and magneto-optic applications.
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