Moiré Superlattices

Transition metal dichalcogenide (TMD) moiré systems provide a highly tunable platform to study strong electronic correlated states.  Recently, fractional filling states have been observed in WSe2/WS2 moiré superlattices with unconventional optical techniques, scanning tunneling microscopy (STM) and scanning microwave impedance microscopy (MIM). However, few electrical-transport and capacitance studies have been reported on this system due to the large contact resistance that exists at metal-TMD junctions. Here, we performed measurements on aligned WSe2/WS2 heterostructures. Our study provides a new technique to explore long-range strong interactions in TMD moiré superlattices.