Influence of interlayer interaction on the charge and lattice dynamics in layered transition-metal chalcogenides

层间相互作用对层状过渡金属硫属化物电荷和晶格动力学的影响

• 批准号: 440841111
• 负责人: Professorin Dr. Christine Kuntscher
• 金额: --
• 依托单位: Lehrstuhl für Experimentalphysik II
• 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/440841111?language=en
• 关键词: Influence; interlayer; interaction; charge; lattice

Layered transition-metal chalcogenides exhibit a plethora of interesting physical properties and exotic phases due to competing correlation effects and topology, such as charge-density wave, Mott insulator, superconductivity, antiferromagnetic topological insulator, Weyl semimetal, and ferromagnetic nodal-line semimetal. Furthermore, they provide an ideal platform for realizing atomically thin, van der Waals crystals with unique properties and excellent prospects for novel applications. For the understanding of the physical properties of these novel 2D crystals, the characterization and understanding of their bulk physical properties is crucial as a preliminary step and is the subject of this project.One key aspect determining the physical properties of two-dimensional, layered materials is the interlayer interaction. In particular, the variation of the interlayer interaction by changing the van der Waals interlayer spacing greatly affects their physical properties and induces phase transitions with emerging exotic phases. The systematic study and understanding of the influence of the interlayer interaction on the charge and lattice dynamics in layered transition-metal chalcogenides are the goal of this project. External pressure is the most effective way for tuning the interlayer spacing and hence the interlayer interaction in a controlled manner. Hence, external pressure will be applied within this project to systematically investigate the influence of interlayer interaction on the charge and lattice dynamics. By pressure-dependent infrared and Raman spectroscopy the charge and lattice dynamics can be studied while tuning the interlayer interaction in layered materials. This way, the pressure-induced electronic changes and phase transitions with emerging exotic electronic phases can be monitored and characterized in detail and with a high energy resolution.As model systems for this study several layered transition-metal chalcogenides are chosen, which on the one hand show interesting physical properties already at ambient pressure such as Weyl semimetal or magnetic topological phase, and on the other hand are very sensitive regarding pressure application.

由于相关效应和拓扑结构，层状的过渡金属质质质层表现出许多有趣的物理特性和异国情调相，例如电荷波，莫特绝缘体，超导能力，超导能力，抗磁性拓扑拓扑绝缘子，WEYL半含量，WEYL半粒细节和效能电磁结节线线线。此外，它们提供了一个理想的平台，可以实现具有独特特性和新颖应用的良好前景的原子薄的范德华晶体。为了理解这些新型2D晶体的物理特性，对它们的批量物理特性的表征和理解至关重要，并且是该项目的主题。确定二维，分层材料的物理特性的一个关键方面是层间相互作用。特别是，通过更改范德华间间距的层间相互作用的变化极大地影响了它们的物理特性，并通过新兴的外来相位诱导相变。该项目的目标是系统的研究和对层间相互作用对电荷和晶格动力学的影响的影响。外部压力是调整层间间距的最有效方法，因此以受控方式进行层间相互作用。因此，该项目中将施加外部压力，以系统地研究层间相互作用对电荷和晶格动力学的影响。通过压力依赖性红外和拉曼光谱法，可以在分层材料中调整层间相互作用时研究电荷和晶格动力学。这样，可以在详细和高能量分辨率的情况下监测和表征压力诱导的电子变化和相位过渡。作为这项研究的模型系统，选择了几种层次的过渡金属核化剂，在一方面，它显示出一种在环境压力上已经显示出有趣的物理特性，例如Weyl Semimetal或其他磁性相位，并且在其他方​​面都非常敏感。