  In monolayers of transition metal dichalcogenides the nonlocal nature of the
effective dielectric screening leads to large binding energies of excitons.
Additional lateral confinement gives rise to exciton localization in quantum
dots. By assuming parabolic confinement for both the electron and the hole, we
derive model wave functions for the relative and the center-of-mass motions of
electron-hole pairs, and investigate theoretically resonant energy transfer
among excitons localized in two neighboring quantum dots. We quantify the
probability of energy transfer for a direct-gap transition by assuming that the
interaction between two quantum dots is described by a Coulomb potential, which
allows us to include all relevant multipole terms of the interaction. We
demonstrate the structural control of the valley-selective energy transfer
between quantum dots.
