Transport phenomena of 2D topological antiferromagnets

In this field, our objective is to carry out electrical transport measurements to explore, discover, and gain insight into new topological and quantum geometrical physics that extend beyond established theories, and to leverage quantum geometrical properties for the advancement of quantum technologies. Electron motions determined by topology and quantum geometry go beyond the E–k dispersion and exhibit many interesting phenomena, such as spin Hall, anomalous Hall, and nonlinear Hall effects. The study of quantum geometry of the wave function has already been a central pillar of modern solid-state physics. Moreover, topology, over the past decade, has taken center stage in condensed matter physics and materials science. Many topological phases, such as topological insulators and Weyl semimetals, have been observed. 2D materials provide substantial advantages in the tunability of their band structure, symmetry, topology, and quantum geometry. Moreover, the interplay between 2D topology and antiferromagnetism is anticipated to unveil increasingly fascinating phenomena, where the Berry curvature is coupled with layers, and quantum metrics arise due to symmetry breaking. Therefore, 2D topological antiferromagnets have been highlighted and are expected to exhibit a wide range of fundamentally new physics such as topological superconducting, Majorana fermions, topological charge fractionalization, topological order, and non-abelian anyons.

Strong light-matter interaction of 2D materials

Light-matter interaction in two-dimensional materials presents exciting opportunities to explore novel quantum phenomena, as these materials enable the creation of distinctive photocurrents through efficient photon absorption and exciton formation, particularly in structures like transition metal dichalcogenides (TMDs) and Weyl semimetals, where the intriguing relationship between quantum geometry and symmetry results in unique photocurrent behaviors. Additionally, these interactions allow for the coupling of light with magnetic excitations, such as magnons—quantized spin waves capable of manipulating spin currents in spintronic applications—thereby paving the way for innovative technologies that blend charge and spin transport. This synergy gives rise to new phenomena like exciton-polaritons, coherent states formed from the strong coupling of excitons and photons, further enhancing the richness of light-matter interactions. Ultimately, investigating these effects in two-dimensional materials unlocks new frontiers for future advancements in quantum technologies, promising breakthroughs in fields such as information processing and energy conversion.

Novel electronic and optical applications of 2D devices

This research is dedicated to uncovering innovative solutions for electronic and optical applications that harness the unique properties of two-dimensional devices, heterostructures, and moiré superlattices. By investigating topology and quantum geometry within these 2D systems, we can explore cutting-edge applications designed to tackle critical challenges faced by modern electronic and optical devices, including concerns regarding energy consumption and heating in electronic systems, as well as noise levels and sensitivity in optical equipment. Specifically, we are particularly interested in developing ultrahigh sensitivity photodetectors, highly efficient wireless microwave energy harvesters, antiferromagnetic logic devices, and low-dissipation electronic devices, all of which have the potential to significantly advance technology by improving performance and sustainability while addressing the ever-growing demands of contemporary applications across various fields.