Engineering topological phases of 2D layered materials

Abstract

In this presentation, we explore the fields of topological insulators (TIs) and two-dimensional materials (2D) materials, which offer promising applications in technology. We highlight the collaborative nature of experimental and theoretical approaches in accurately predicting the properties of quantum materials. Our focus centers on 2D materials with honeycomb structures which showcase the emergence of unique properties through heterojunctions formed by layer stacking. Central to our research is the investigation of TIs, unveiling surface conducting states within insulating bulk materials. We elucidate topology principles, showcasing their invariance under continuous deformations. Through theoretical calculations and experimental validation, we uncover distinctive properties and potential applications in spintronics and quantum computing. Furthermore, we explore the manipulation of topological properties through external factors like strain, substrate engineering, and material functionalization. By adjusting lattice structures and chemical compositions, we demonstrate transitions between trivial and non-trivial topological phases in various 2D materials. Our research extends beyond theory, achieving successful experimental realization of proposed materials. Collaborating with experimental groups, we validate our findings using scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES) techniques. In summary, our work advances understanding of topological phases and band engineering in 2D materials, promising innovations across various technological fields. By uncovering principles behind topological insulators and exploring novel material designs, we contribute to the expanding realm of quantum materials, paving the way for future breakthroughs.