Observation of Gamma-Valley Moire Bands and Emergent Hexagonal Lattice in Twisted Transition Metal Dichalcogenides

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