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

长程磁序、强关联、超导电性和平带工程的发现刺激了二维量子材料在单片或组合片结构中的涌现。本提议的科学目标是利用2D金属-有机骨架(2D-MOF)系统地探索这些有趣的物理现象，这些2D-MOF可以构建在原子定义良好的贵金属晶体石墨烯上，也可以与2D过渡金属二卤化物(TMD)(如超导NbSe2)相结合，从而实现新颖的2D-MOF/TMD层状异质结构。通过多技术方法(特别是扫描隧道显微镜/光谱、角度分辨光电子能谱、X射线光电子能谱、低能电子衍射和X射线磁性圆二色谱)与密度泛函理论计算相结合，我们将探索2D-MOF的新途径，为合作磁性、拓扑态和超导提供前景。我们的研究策略需要在超高真空(UHV)条件下对所提出的新型2D量子材料进行原子精确的设计和制造。精心设计的分子前驱体将由合成化学家以高纯度提供，并将开发协议来整合金属原子，并在超高压中提供高质量的金属-有机涂层。合适的TMD样品将通过分子束外延(MBE)来制备。这项丰富的科学活动依赖于我们椅子上复杂的实验基础设施。这一提议是及时的、中肯的，我们预计这一设想的进展将通过建立一种新的设计者方法来实现具有新性质的功能层状异质结构，从而影响量子科学和技术领域。

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.