Magnetic bound states in 2D superconductors

二维超导体中的磁束缚态

• 批准号: 505617192
• 负责人: Professorin Dr. Katharina Franke
• 金额: --
• 依托单位: SPINTEC Laboratory
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/505617192?language=en
• 关键词: Magnetic; bound; states; 2D; superconductors

Exchange coupling of magnetic adsorbates on superconductors induces Yu-Shiba-Rusinov (YSR) states. These decay rapidly on a three-dimensional superconductor. In contrast, a two-dimensional superconductor enhances the decay length and, thus, enhances coupling of YSR states. The splitting and shift of coupled YSR states provide signatures of hybridization and magnetic interactions. In certain parameter regimes, extended structures are expected to host topological edge states. To overcome the limited range of interactions on bulk three-dimensional superconductors, we will grow and characterize heterostructures based on two-dimensional superconductors. We will profit from the expertise in MBE growth of one of the partners, while the other partners will use high-resolution scanning tunneling microscopy to track the evolution of the YSR states from single molecular adsorbates to two-dimensional islands on monolayers of NbSe2 and graphene on Rhenium. The flexibility in the choice of molecular adsorbate provides a large parameter space for different magnetic moments, different exchange coupling to the surface, as well as substrate-mediated intermolecular coupling strength. This will allow us to explore a large range of the magnetic phase diagram and search for topological states. Additionally, we will grow heterostructures of atomically thin layers of NbSe2 and magnetic transition-metal dichalcogenides. Here, the choice of the magnetic layer allows us to tune the exchange coupling strength to the substrate. We will also investigate the influence of the island size on the possibility of topological edge states and eventually investigate the interaction of adjacent islands. Our systematic analysis of YSR states of magnetic metal-organic and inorganic layers on two-dimensional superconductors will enable fundamental insights into exchange coupling to the substrate as well as magnetic textures of the adlayers. Our insights may help in the search for topological states in heterostructures of two-dimensional superconductors.

磁性吸附物在超导体上的交换耦合诱导YSR态。它们在三维超导体上迅速衰变。相比之下，二维超导体增强了衰变长度，从而增强了YSR态的耦合。耦合YSR态的分裂和位移提供了杂化和磁相互作用的特征。在某些参数范围内，扩展结构被期望具有拓扑边态。为了克服三维超导体相互作用的有限范围，我们将生长和表征基于二维超导体的异质结构。我们将受益于其中一个合作伙伴在MBE生长方面的专业知识，而其他合作伙伴将使用高分辨率扫描隧道显微镜来跟踪YSR状态从单分子吸附物到NbSe 2和铼上石墨烯单层上的二维岛的演变。分子吸附物选择的灵活性为不同磁矩、与表面的不同交换耦合以及基质介导的分子间耦合强度提供了大的参数空间。这将使我们能够探索大范围的磁相图和搜索拓扑状态。此外，我们将生长NbSe 2和磁性过渡金属二硫属化物的原子薄层的异质结构。在这里，磁性层的选择允许我们调整到衬底的交换耦合强度。我们还将研究岛的大小对拓扑边缘状态的可能性的影响，并最终研究相邻岛屿之间的相互作用。我们的系统分析的YSR状态的磁性金属有机和无机层的二维超导体将使交换耦合到基板以及磁性纹理的adlayers的基本见解。我们的见解可能有助于在二维超导体的异质结构的拓扑状态的搜索。