Strong correlations in two-dimensional transition metal dichalcogenides

Since the discovery of graphene, the development of two-dimensional material research has enabled the exploration of a rich variety of exotic quantum phenomena that are not accessible in bulk materials. These two-dimensional materials offer a unique platform to build novel quantum devices. Layered transition metal dichalcogenides, when thinned down to atomic thicknesses, exhibit intriguing physical properties such as strong electron correlations. The study of strongly-correlated phenomena in two-dimensional transition metal dichalcogenides has been a major research frontier in condensed matter physics. In this article, we review recent progress on strongly-correlated phenomena in two-dimensional transition metal dichalcogenides, including Mott insulators, quantum spin liquids, and Wigner crystals. These topics represent a rapidly developing research area, where tremendous opportunities exist in discovering exotic quantum phenomena, and in exploring their applications for future electronic devices.