Excited Rydberg states in MoSe2/WSe2 heterostructures

The functional form of Coulomb interactions in the transition metal dichalcogenides (TDMs) and other van der Waals solids is critical to many of their unique properties, e.g. strongly-correlated electron states, superconductivity and emergent ferromagnetism. This paper presents measurements of key excitonic energy levels in MoSe2/WSe2 heterostructures. These measurements are obtained from resonance Raman experiments on specific Raman peaks only observed at excited states of the excitons. This data is used to validate a model of the Coulomb potential in these structures which predicts the exciton energies to within similar to 5 meV. This model is used to determine the effect of heterostructure formation on the single-particle band gaps of the layers and will have a wide applicability in designing the next generation of more complex TDM structures.

Automated summary

The study emphasizes the importance of the functional form of Coulomb interactions in transition metal dichalcogenides (TDMs) and van der Waals solids in determining their unique properties. It presents measurements of key excitonic energy levels in MoSe2/WSe2 heterostructures, obtained from resonance Raman experiments. The data validates a model predicting exciton energies, demonstrating the potential impact of heterostructure formation on single-particle band gaps and its applicability in designing future TDM structures.