Excited Rydberg states in MoSe2/WSe2 heterostructures. (7th June 2021)

• Record Type: Journal Article
• Authors: Viner, Jacob J S; McDonnell, Liam P; Ruiz-Tijerina, David A; Rivera, Pasqual; Xu, Xiaodong; Fal'Ko, Vladimir I; Smith, David C
• Is Part Of: 2D materials. Volume 8:Number 3(2021)
• Publication Date: 2021-06-07
• Subjects: MoSe2 -- WSe2 -- ML -- exciton -- heterostructure -- 2s -- excited states; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/ac0296
• Languages: English
• ISSNs: 2053-1583

Abstract

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.