Excited Rydberg states in MoSe2/WSe2heterostructures

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Abstract

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 ∼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.

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Viner, J. J. S., McDonnell, L. P., Ruiz-Tijerina, D. A., Rivera, P., Xu, X., Fal’Ko, V. I., & Smith, D. C. (2021). Excited Rydberg states in MoSe2/WSe2heterostructures. 2D Materials, 8(3). https://doi.org/10.1088/2053-1583/ac0296

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