Local Probe Studies of Electronic Structure in Monolayer TaSe2

Metallic transition metal dichalcogenides (TMDs) are ideal platforms for exploring collective electronic phenomena such as charge density wave (CDW) and superconductivity. Thinning down TMDs to the monolayer limit may help clarify the role of interlayer coupling effect and dimensionality in these intriguing phases. Here we present an electronic structure study of single-layer TaSe2 by means of scanning tunneling microscopy/spectroscopy, angle-resolved photoemission spectroscopy and first-principle calculation. It provides new insight into the interplay among charge order, dimensionality and electron-electron interaction in this model CDW system.