Molybendum disulphide along with other transition metal dichalcogenides has emerged as another star in the family of atomically thin two dimensional materials. Different from its bulk counterpart, few-layer MoS2 has appreciable variations in the electronic band structures, and evolves into a direct bandgap semiconductor when it is thinned down to a monolayer form. Furthermore, few-layer MoS2 exhibits oscillatory structural symmetry with odd layer having inversion symmetry broken and even layer recovering its inversion symmetry.
