Observation of {\Gamma}-valley moir'e bands and emergent hexagonal lattice in twisted transition metal dichalcogenides (original) (raw)

2022, Cornell University - arXiv

Twisted van der Waals heterostructures have recently been proposed as a condensedmatter platform for realizing controllable quantum models due to the low-energy moiré bands with specific charge distributions in moiré superlattices. Here, combining angleresolved photoemission spectroscopy with sub-micron spatial resolution (μ-ARPES) and scanning tunneling microscopy (STM), we performed a systematic investigation on the electronic structure of 5.1° twisted bilayer WSe2 that hosts correlated insulating and zeroresistance states. Interestingly, contrary to one's expectation, moiré bands were observed only at-valley but not-valley in μ-ARPES measurements; and correspondingly, our STM measurements clearly identified the real-space honeycomb-and Kagome-shaped charge distributions at the moiré length scale associated with the-valley moiré bands. These results not only reveal the unsual valley dependent moiré-modified electronic structure in twisted transition metal dichalcogenides, but also highlight the-valley moiré bands as a promising platform for exploring strongly correlated physics in emergent honeycomb and Kagome lattices at different energy scales.