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Using a multiscale computational approach, we probe the origin and evolutionof ultraflatbands in moir\'e superlattices of twisted bilayer MoS$_2$, aprototypical transition metal dichalcogenide. Unlike twisted bilayer graphene,we find no unique magic angles in twisted bilayer MoS$_2$ for flatbandformation. Ultraflatbands form at the valence band edge for twist angles($\theta$) close to 0$^\circ$ and at both the valence and conduction band edgesfor $\theta$ close to 60$^\circ$, and have distinct origins. For$ \theta$ closeto 0$^\circ$, inhomogeneous hybridization in the reconstructed moir\'esuperlattice is sufficient to explain the formation of flatbands. For $\theta$close to 60$^\circ$, additionally, local strains cause the formation ofmodulating triangular potential wells such that electrons and holes arespatially separated. This leads to multiple energy-separated ultraflatbands atthe band edges closely resembling eigenfunctions of a quantum particle in anequilateral triangle well. Twisted bilayer transition metal dichalcogenides arethus suitable candidates for the realisation of ordered quantum dot array.

Origin and Evolution of Ultraflatbands in Twisted Bilayer Transition Metal Dichalcogenides: Realization of Triangular Quantum Dot Array