Year: 2021
Type: preprint
Abstract: The functional form of Coulomb interactions in the transition metal dichalcogenides 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 / 2.5%. 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 transition metal dichalcogenide structures.
Source: arXiv (Cornell University)
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: ADEPT - Advanced Devices by ElectroPlaTing, G2661251470, Engineering van der Waals heterostructures: from atomic level layer-by-layer assembly to printable innovative devices, G4579049149, G5166783610, G516966722, The Royce: Capitalising on the investment, Van der Waals Heterostructures of 2D Materials, G715292007, G8430280503, G8547666004, Quantum Materials by Twistronics
OpenAlex ID: W3135955818