Controlling structure and interfacial interaction of monolayer TaSe₂ on bilayer graphene

We report a controlled growth of monolayer TaSe₂ on a bilayer graphene substrate using molecular beam epitaxy. By carefully optimizing the growth control, we were able to isolate two structural phases, 1H and 1T, and investigated their electronic structure using angle-resolved photoemission spectroscopy (ARPES). In addition to the expected differences in the electronic band structure between 1H and 1T phases, our ARPES results reveal significant differences in charge transfer and band hybridization at the interface, which is much more pronounced in 1H-TaSe₂. The distinct interfacial interactions are attributed to the differences in work function and interlayer distance.