Exciton moiré potential in twisted WSe<sub>2</sub> homobilayers modulated by electric field

The nanoscale periodic energy potential is introduced by moiré pattern in two stacked transition metal dichalcogenide monolayers with lattice mismatch or crystal orientation misalignment. It is demonstrated that the moiré potential can act as a diffusion barrier that affects interlayer exciton transport, providing an opportunity for studying the electronic and optical properties of moiré excitons. However, the current research on the modulation of exciton moiré potential in twisted homobilayers is limited. In this paper the effect of externally applied perpendicular electric field on the exciton moiré potential in twisted WSe₂ homobilayers with different rotation angles is studied by using first principle calculations. It is found that the amplitude and shape of the interlayer exciton moiré potential are dependent on the relative rotation angle between the layers and electric field intensity. The amplitude and shape of the moiré potential in the twisted WSe₂ homobilayers with different rotation angles vary with the electric field intensity (\begin{document}$\leqslant $\end{document}1 V/nm). These results provide theoretical basis and data prediction for modulating the local and the non-local transition of interlayer excitons, and are of great significance in promoting the development of semiconductor devices such as artificial excitonic crystals and nanoarray lasers.