When Transition Metal Dichalcogenides Twist: Opportunities for Spintronics and Quantum Technologies

Moiré superlattices form quantum-active interfaces in which geometric reconstruction of stacked two-dimensional (2D) materials generates emergent quantum phases that are not present in the parent materials. These engineered interfaces give rise to a wide range of quantum phenomena, including strongly correlated electronic states, flat-band formation, topological phases of matter, and spin–valley locking, all of which can be tuned in situ through the twist angle. Twisted hetero/homostructures of 2D transition metal dichalcogenides (TMDs) exhibit an unprecedented degree of control over electronic and spin degrees of freedom, driving rapid advances in the emerging field of twistronics and opening pathways toward next-generation spintronic device applications. In this Review, we examine the fundamental concepts, applications, and prospects of twisted 2D TMDs. We outline the evolution from three-dimensional (3D) to 2D materials and the concept of twistronics, then highlight the emergent structural and magnetic properties of twisted 2D TMDs and their heterostructures. Finally, we discuss the remaining challenges and future directions toward applications in spintronic and quantum technologies.