Studies of the electronic structure of VS₂ and possible CDW transition

2D-transition metal dichalcogenides (2D-TMDs) host various phenomena of wide interest such as charge density wave (CDW), ferromagnetism, superconductivity, mott-insulator, and catalytic behavior. CDW ordering is common in 2D-TMDs and its mechanisms have been extensively studied in both bulk and monolayer specimens but remains a topic of debate. Here we report on the electronic structure of VS₂. The ARPES spectra reveal a Fermi surface largely dominated by V-3d bands which cross the Fermi level along A-L direction. Photon energy dependent ARPES measurements indicate minimal k_z dependence of the V-3d bands, consistent with its 2D nature. Most importantly, the Fermi surface map displays a pronounced decrease in the intensity of V-3d band away from the Brillouin zone (BZ) center. Such a feature has been attributed by some to a CDW gap opening in VSe₂ suggesting a similar phenomenon in VS₂. Furthermore, the energy distribution curves (EDCs) in the vicinity of the Fermi surface reveal the existence of dispersion-less flat bands. We also detect the presence of Dirac surface states, also observed in VTe₂, and VSe₂ suggesting its prevalence in VX₂ family of materials.