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Optical properties of transition metal dichalcogenides monolayer of MoS2 are analyzed using multi-orbital tight-binding models with only Mo d-orbitals (three-band model) and with an inclusion of S p-orbitals (six-band model). We look at band structures, momentum matrix elements between valence and conduction band, and joint optical density of states. Good agreement between the two models is shown in a vicinity of K point of the Brillouin zone. On line connecting K and Γ points, a localdoi:10.12693/aphyspola.132.313 fatcat:whugjlbgjvcrtljfwlcfpd6zu4