Electronic structure of transition metal-trihalide based van der Waals heterostructures

过渡金属三卤化物基范德华异质结构的电子结构

• 批准号: 456702393
• 负责人: Dr. Andreas Koitzsch
• 金额: --
• 依托单位: Institut für Festkörperforschung
• 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/456702393?language=en
• 关键词: Electronic; structure; transition; metal; trihalide

Heterostructures made of 2D material years attracted considerable scientific attention in the last years. Recently the field received an additional boost by the discovery of magnetic 2D materials and of the outstanding properties of twisted bilayer graphene. Some 2D materials are considered potential candidates to overcome physical limitations of conventional semiconductor technology, which is becoming a bottleneck for advanced device manufacturing.The aim of the project is the investigation of the electronic structure of atomically thin transition metal halides such as Cr(Cl,Br,I)3 and RuCl3 and their heterostructures with graphene by means of photoemission spectroscopy. This should lead to a better understanding of their properties and the way external parameters influence these systems. While RuCl3 is a candidate for the realization of a quantum spin liquid, Cr(Cl,Br,I)3 retains magnetism down to the monolayer and is a promising material for nanoscale devices. In particular, heterostructures with graphene are an important building block of devices based on 2D materials. Knowledge of band alignment and hybridization effects is crucial for a thorough understanding of the interface properties. Charge transfer across the heterostructure may occur and modifications of the magnetic exchange parameters. Moreover, the electronic structure of heterobilayers and thin films may change even on a qualitative level when doped or after controlled defect creation.

由二维材料制成的异质结构近年来引起了科学界的广泛关注。最近，由于磁性2D材料和扭曲双层石墨烯的杰出特性的发现，该领域得到了额外的推动。一些二维材料被认为是克服传统半导体技术的物理限制的潜在候选者，这正在成为先进器件制造的瓶颈。该项目的目的是通过光电子能谱研究原子级薄的过渡金属卤化物如Cr（Cl，Br，I）3和RuCl 3及其与石墨烯的异质结构的电子结构。这将导致更好地了解它们的属性和外部参数影响这些系统的方式。虽然RuCl 3是实现量子自旋液体的候选者，但Cr（Cl，Br，I）3保留了单层的磁性，并且是用于纳米器件的有前途的材料。特别地，具有石墨烯的异质结构是基于2D材料的器件的重要构建块。谱带排列和杂化效应的知识对于深入理解界面性质是至关重要的。可以发生穿过异质结构的电荷转移和磁交换参数的修改。此外，异质双层和薄膜的电子结构在掺杂时或在受控缺陷产生之后甚至可以在定性水平上改变。