Erfu Group | Research

Two-dimensional semiconductors

By successfully peeling off the Van de Waals crystals into one atom thick, a new wave of fundamental research and technological breakthroughs has been launched. Among the plenty of two-dimensional materials, transition metal dichalcogenides (TMDs, MX₂ with M = Mo, W and X = S, Se, Te) are the most studied two-dimensional semiconductors. Monolayer TMDs materials have direct bandgap with unique electronic, spin, and valley properties, which makes them to be excellent candidate materials for future semiconductor optoelectronic applications. Our research focuses on the light-matter interactions, especially exciton physics and correlated electrons in these 2D materials.

Illustration of a two-dimensional semiconductor

Correlated states in moiré systems

When two atomically thin van der Waals materials are vertically stacked together, they can form a new type of structure, known as the moiré superlattice. The emergence of the moiré superlattice makes moiré materials a unique platform for studies of strong correlation physics, such as the discovery of superconductivity near correlated insulating states in magic-angle twisted bilayer graphene. We focus on semiconductor moiré materials, especially TMDs. We interest in their optical properties, strong correlated electronic states, moiré excitons and potential optoelectronic device applications.