Twist-dependent intra- and interlayer excitons in moire MoSe2 homobilayers

Abstract

Optoelectronic properties of van der Waals homostructures can be selectively engineered by the relative twist angle between layers. Here, we study the twist-dependent moire coupling in MoSe2 homobilayers. For small angles, we find a pronounced redshift of the K-K and Γ-K excitons accompanied by a transition from K-K to Γ-K emission. Both effects can be traced back to the underlying moire pattern in the MoSe2 homobilayers, as confirmed by our low-energy continuum model for different moire excitons. We identify two distinct intralayer moire excitons for R-stacking, while H-stacking yields two degenerate intralayer excitons due to inversion symmetry. In both cases, bright interlayer excitons are found at higher energies. The performed calculations are in excellent agreement with experiment and allow us to characterize the observed exciton resonances, providing insight about the layer composition and relevant stacking configuration of different moire exciton species.

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• Theory of phonon sidebands in the absorption spectra of moiré exciton-polaritons
• Effective long-range attraction of moiré excitons under the influence of atomic reconstructions and anisotropic screening
• Emergence of non-uniform strain induced exciton species in homo- and heterobilayer transition metal dichalcogenides