Strongly correlated systems provide a fertile ground for discovering exotic states of matter, such as those with topologically non-trivial properties. Among these are geometrically frustrated magnets, which harbor spin liquid phases with fractional excitations. On the experimental front, this has motivated the search for new low dimensional quantum materials. On the theoretical front, this area of research has led to analytical and numerical advances in the study of quantum many-body systems.
The reduced dimension in 2D materials results in large specific surface areas, making the surface/interfacial states play an essential role in determining their physical and chemical properties. Thus, the energy band model widely used for bulk materials may not provide a comprehensive description of 2D systems.