Exploring emergent properties in two-dimensional metal-organic quantum materials

2D量子材料的涌现领域受到了长程磁有序、强关联、超导性和单层或组合层结构中的平带工程的发现的刺激。本提案的科学目标是系统地探索这些有趣的物理现象与2D金属有机框架（2D-MOF），无论是在原子上定义良好的贵金属晶体，石墨烯或与2D过渡金属二硫属化物（TMD），如超导NbSe 2相结合，以实现新的2D-MOF/TMD层状异质结构。通过多技术方法的手段（包括显着的扫描隧道显微镜/光谱学，角分辨光电子能谱，X射线光电子能谱，低能电子衍射和X射线磁圆二色性）结合密度泛函理论计算，我们将探索新的途径，在2D-MOFs提供合作磁性，拓扑状态和超导性的前景。我们的研究策略要求在超高真空（UHV）条件下对所提出的新型2D量子材料进行原子级精确设计和制造。精心设计的分子前体将由合成化学家以高纯度提供，并将开发协议以整合金属原子并在UHV中提供高质量的金属有机层。合适的TMD样品将通过分子束外延（MBE）制备。这种丰富的科学活动依赖于我们椅子的复杂实验基础设施。这一建议是及时的，中肯的，我们预计，预期的进展将通过建立一种新的设计方法来影响量子科学和技术领域的功能分层异质结构与新的属性。

The emergent field of 2D quantum materials was stimulated by the discovery of long-range magnetic order, strong correlations, superconductivity and flat band engineering in single or combined sheet structures. The scientific goal of the present proposal is to systematically explore these intriguing physical phenomena with 2D metal-organic frameworks (2D-MOFs), either fabricated on atomically well-defined noble metal crystals, graphene or combined with 2D transition metal dichalcogenides (TMDs) such as superconducting NbSe2 so as to realize novel 2D-MOF/TMD layered heterostructures. By means of a multi-technique methodological approach (including notably scanning tunneling microscopy/spectroscopy, angle-resolved photoelectron spectroscopy, X-ray photoelectron spectroscopy, low-energy electron diffraction and X-ray magnetic circular dichroism) in combination with density functional theory calculations, we shall explore new avenues in 2D-MOFs providing prospects for cooperative magnetism, topological states and superconductivity. Our research strategy requires atomically precise design and fabrication of the proposed novel 2D quantum materials in ultra-high vacuum (UHV) conditions. The carefully designed molecular precursors will be provided in high-purity by synthetic chemists and protocols will be developed to integrate metal atoms and afford high-quality metal-organic layers in UHV. Suitable TMD samples will be prepared by molecular beam epitaxy (MBE). This rich scientific activity relies on the sophisticated experimental infrastructure of our chair. This proposal is timely, pertinent and we expect that the envisioned progress will impact the field of quantum science and technology by establishing a new designer approach towards functional layered heterostructures with novel properties.