SCIENTISTS DISCOVER ‘FLIPPING’ LAYERS IN HETEROSTRUCTURES CAUSE CHANGES IN THEIR PROPERTIES
Two different vdW heterostructures. The left consists of WS2 on top of WSe2, and the right consists of WSe2 on top of WS2. The two TMD layers are stacked on top of h-BN and Si/SiO2, which are substrates. Credit: Institute for Basic Science Transition metal dichalcogenide (TMD) semiconductors are special materials that have long fascinated researchers with their unique properties. For one, they are flat, one-atom-thick two-dimensional (2D) materials similar to that of graphene. They are compounds that contain different combinations of the transition metal group (e.g., molybdenum, tungsten) and chalcogen elements (e.g., sulfur, selenium, tellurium). What's even more fascinating is that [...]