Excited Rydberg states in MoSe 2 /WSe 2 heterostructures

• Published in: 2d materials Vol. 8; no. 3; p. 35047
• Main Authors: Viner, Jacob J S, McDonnell, Liam P, Ruiz-Tijerina, David A, Rivera, Pasqual, Xu, Xiaodong, Fal’Ko, Vladimir I, Smith, David C
• Format: Journal Article
• Language: English
• Published: United Kingdom IOP Publishing 01.07.2021
• ISSN: 2053-1583; 2053-1583
• DOI: 10.1088/2053-1583/ac0296

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 MoSe 2 /WSe 2 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.